Cover photo: Thearon W. Henderson/Getty Images)

Marlon Mack has gone from relative unknown to fantasy darling over the last couple of weeks, but one thing that could derail that storyline is an injury, which it appears Mack is still dealing with. 

Mack wasn't able to practice on Monday, working out with trainers on the side of Colts practice instead. 

The Colts had a bye this week, so it's still unclear exactly what kept Mack sidelined. He was dealing with an ankle injury ahead of the Colts game against the Raiders and missed practice that week too. That didn't stop him from tearing up the Raiders D for 132 yards and 2 TDs. 

That was Mack's second straight 100-yard game following a breakout 89-yard performance the week before that. He's emerged as the Colts lead back, and in an offense that's scoring points in bunches, a top RB option on fantasy teams as well. 

With an extra week off to recover from (presumably) the ankle injury, it doesn't seem Mack is in danger of missing this week's game against the Jags.