Dolphins RB Arian Foster announced his retirement in a written statement on Monday. "There comes a time in every athlete's career when their ambition and their body are no longer on the same page," Foster wrote. "I've reached that point ... I know it's not commonplace to do it midseason, but my body just can't take the punishment this game asks for any longer." Foster dealt with numerous injuries throughout his 8-year career, including a torn meniscus and a torn Achilles. He mustered just 2.6 yards per carry over between 2015 and 2016. RB Jay Ajayi, riding back-to-back 200-yard games, is locked in as Miami's feature back going forward. He'll be backed up by Damien Williams and Kenyan Drake.

Dolphins HC Adam Gase admitted Monday that RB Arian Foster (groin, hamstring) is "not 100%." That was pretty evident based on Foster's usage against the Steelers yesterday: 11 snaps, 5 touches. RB Jay Ajayi, meanwhile, ripped off 204 yards and 2 scores on 25 carries. That should earn him the lead gig going forward, but we wonder if Miami will get Foster more involved when he's back to full strength.

Dolphins RB Arian Foster (hamstring, groin) is officially active for today’s game against the Steelers. Pittsburgh is tough against the run, but Foster could do some damage in the passing game. He’s a lower-end RB2 for Week 6.

Dolphins RB Arian Foster (hamstring, groin) will play against the Steelers today, according to NFL Network's Aditi Kinkhabwala. He must have checked out ok in pregame warmups. Foster figures to serve as Miami's lead back today and usually doesn't play if he's not confident in his health. But a Pittsburgh defense allowing just 4.0 yards per carry leaves Foster as a low-end RB2 for Week 6.

Dolphins HC Adam Gase said Friday that RB Arian Foster (hamstring, groin) will be a game-time decision for this weekend's tilt with the Steelers. Foster remained limited in practice this week. We'll find out his official status by noon ET on Sunday, but Foster is tough to trust in fantasy lineups at less than 100%. The matchup isn't good, either, against a Pittsburgh D allowing just 4.0 yards per carry to RBs.

The Dolphins expect RB Arian Foster (groin, hamstring) to return for this weekend's game against the Steelers, according to the Miami Herald's Armando Salguero. Foster put in 3 limited practices this week but was held out of Sunday's game vs. Tennessee as Miami continued to play it safe with the oft-injured RB. Barring a setback over the next few days, he figures to be reinserted as the team's lead back. Pittsburgh is tough against the run but has allowed the 3rd most receptions and 2nd most receiving yards to RBs. Foster will be a much better Week 6 play in PPR leagues than non-PPR.

Dolphins RB Arian Foster (hamstring) is inactive for today’s game against the Titans. He’s trending toward a Week 6 return. Jay Ajayi figures to lead Miami’s committee backfield vs. Tennessee but is a shaky fantasy play.

Dolphins RB Arian Foster (hamstring) is doubtful for Sunday’s game against the Titans. He returned to limited practices this week and might be back for Week 6. Jay Ajayi figures to lead Miami’s committee backfield this weekend but is a shaky fantasy play.

Dolphins RB Arian Foster (groin) returned to practice on Wednesday. That seemingly puts him on track to play against the Titans this weekend, although insider Armando Salguero said earlier today that he didn't expect Foster to play. We'll continue to keep an eye on him. None of Miami's other RBs stepped up in his absence, so a healthy Foster figures to return to a lead role.

Dolphins RB Arian Foster (groin) remained sidelined for Tuesday's practice. It's early in the week, so this doesn't kill his chances of returning for Sunday's game against the Titans, but he's not off to a good start. Jay Ajayi served as Miami's top RB last week but finished with just 46 total yards on 8 catches. This remains a situation to avoid.

Dolphins RB Arian Foster (groin) has been ruled out for Thursday night's game against the Bengals. There's still no timetable for his return. Miami will again go with a 4-man committee backfield led by Kenyan Drake and Jay Ajayi. It's a situation to avoid in fantasy lineups.

Dolphins HC Adam Gase hinted Monday that RB Arian Foster (groin) will not play against the Bengals on Thursday night. "We're going to make sure he's at the right place for us," Gase said. The short week isn't doing Foster any favors. We'll see if he can get ready for Week 5. Kenyan Drake led Miami's committee backfield in Sunday's win over the Browns but played just 40% of the snaps and totaled 11 touches. It's a situation to avoid in a rough spot in Cincinnati.

Dolphins RB Arian Foster (groin) has been ruled out for Sunday's game against the Browns. He didn't practice all week and certainly isn't a lock to return for Week 4. Jay Ajayi figures to serve as the lead back vs. Cleveland, but Kenyan Drake, Damien Williams and/or Isaiah Pead all figure to be involved as well. Ajayi is just a RB3 or flex option.

Dolphins RB Arian Foster (groin) remained sidelined on Thursday. Fantasy owners should be moving forward as if he won't play against the Browns this weekend. That'd leave Jay Ajayi as Miami's lead back.

NFL Network's Ian Rapoport calls Dolphins RB Arian Foster (groin) a "long shot" for Sunday's game against the Browns. Foster didn't practice on Wednesday. Look for Jay Ajayi to lead Miami's backfield this weekend, with rookie Kenyan Drake mixing in.