DAVIE, Fla. -- Miami Dolphins practice began Monday with first-team running back Jay Ajayi on the sideline, riding a stationary bike and making it harder for the teams ground game to get rolling.Ajayi was held out of the first workout in full pads because of knee trouble, an issue that hurt his draft status in 2015. He and the Dolphins said the latest injury isnt serious, but his absence comes at a position already filled with uncertainty.The more you can keep that group working together, the better, coach Adam Gase said. But this is the NFL, right? This is what happens. Next man up.Not quite ready to be the next man up is four-time Pro Bowler Arian Foster, making a comeback from Achilles tendon surgery last fall. Foster signed with Miami last month and was cleared to join practice Sunday, but the Dolphins plan to phase him in slowly.Among the other running backs, Damien Williams reported out of shape and has yet to practice, and Isaiah Pead limped off the field midway through Mondays drills. Also contending for playing time are third-round draft pick Kenyan Drake and veteran Daniel Thomas.Ajayi said he suffered a bone bruise Sunday which caused swelling in his left knee. Gase noted it was Ajayis other knee that required surgery for a torn ACL in 2011, when he was at Boise State.I think he was worried it was more than what it was, Gase said. Thankfully its on the other leg.Even so, Ajayi joined Gases pals Peyton Manning and Wes Welker -- among others -- as a spectator at the workout.Ajayi said he expects to be back to normal in a couple of days, resuming his pursuit of the starting job as a successor to Lamar Miller, who departed via free agency during the offseason.Ajayi played in only nine games last season because of a rib injury, and rushed for 187 yards in 49 carries as Millers backup.Opportunities like this are very limited to be a starter in the NFL, Ajayi said. Im excited.He said hes more comfortable and confident than he was as a rookie.Last season I went through some ups and downs, he said, but I learned a lot.A fifth-round draft pick, Ajayi likely would have gone higher if not for lingering concerns about his right knee. He rushed for 3,796 yards and 50 touchdowns in college, and as a senior became the first player in FBS history to gain at least 1,800 yards rushing and 500 receiving in a season.First-year coach Gase was impressed by the 229-pound Ajayi in offseason drills and believes he could emerge as the biggest surprise of training camp.Or perhaps it will be Foster. Injuries limited him to 25 games in the past three years with the Houston Texans, and he played in just four games last season, averaging 2.6 yards per carry.But Foster said he feels healthier than 12 months ago. When he took the conditioning test at the start of camp, Gase received this appraisal of Foster from an assistant coach: He absolutely annihilated it.I think he was trying to prove a point to us, like, `Im ready to go, Gase said.Like Ajayi, Foster knows theres a job available.---AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL---Follow Steven Wine on Twitter: http://twitter.com/Steve-Wine. 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REGINA -- Corey Chamblin had his starter back Thursday. Darian Durant returned under centre with the Saskatchewan Roughriders after suffering a foot injury in last weeks 39-28 road win over the Toronto Argonauts. Durant had a walking boot on his foot earlier in the week and didnt practise before Thursday. Durant, 30, split snaps with the starting offence and performed well, Chamblin said. However, the Riders head coach is taking a wait-and-see approach regarding whether Durant will face the Hamilton Tiger-Cats on Sunday at Mosaic Stadium. "Darian looked pretty good . . . you could tell he had a day off as far as his throwing but other than that he looked good," Chamblin said. "He says he feels like hes in that 85-90 per cent range and can tape it up and do some things and be ready to go. "But if he feels like hes limping and cant do what the gameplan says then he probably wont go. We want to make sure how healthy he is, if he felt any pain, does he feel like hes mobile enough and do we feel like hes mobile enough?" Backup Drew Willy also practised with the starters Thursday after seeing plenty of time with the No. 1 unit earlier this week with Durant out. "That was the good thing about it," Chamblin said. "When Darian didnt practise Day 1 it allowed Drew to get his reps in and that was pretty good for him." Durant has had a solid start to the season for the unbeaten Riders (3-0). He has completed 54-of-75 passes (72 per cent) for 674 yards with eight touchdowns and no interceptions and has a league-best efficiency rating of 135.1. Sophomore Willy has made one career CFL start, that being a 28-17 loss to Montreal last September. The former University of Buffalo star was 22-of-34 passing for 225 yards and a TD with two interceptions. Whoever starts against Hamilton will have the benefit of another reliable receiver in the lineup. Chamblin said veteran slotback Geroy Simon, a key off-season acquisiition from B.dddddddddddd.C., will make his long-awaited Saskatchewan debut after missing the clubs first three games with a leg injury. "Superman will fly," Chamblin said of Simon, who traditionally strikes a Superman pose after each TD he scores. "What people dont understand is with Geroy you dont even notice him and not in a bad way. "Its like hes been here forever, hes woven himself in and just brings confidence to the guys and confidence to the quarterback knowing he has another set of sure hands. For the younger guys, its being around a legend because hes going to be a Hall of Famer one day and he helps them take their game to a new level." Simon, 37, is a two-time Grey Cup champion and six-time league all-star over his 14-year CFL career. Hes the all-time leader in receiving yards (15,787) and needs 29 catches to break Ben Cahoons league record of 1,017. Simon joins a Saskatchewan offence thats on a nice roll. The Riders lead the CFL in scoring (38 points per game) and rushing (173 yards) and are second in total yards (398.7). Running back Kory Sheets has a league-best 442 rushing yards, the highest three-game total to start a season in CFL history. Sheets ran for a career-high 178 yards against Toronto and will be key performer against a Hamilton defence allowing 147.3 yards per game rushing and 8.8 yards per run attempt. Hamiltons defence is also allowing 29.7 points per game as well. Sundays contest will also mark the return Kent Austin to Saskatchewan. Austin guided the Riders to a Grey Cup win in 89 as the starter before taking the club to another CFL title in 07 in his first season as a head coach. Two months later, Austin left Saskatchewan to become the offensive co-ordinator at his alma mater, Ole Miss, before being named Cornells head coach Jan. 26, 2010. 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