The running back missed the second half of the 2012 season after sustaining a Lisfranc injury.
Fisch told the Florida Times-Union: "We have to make sure he can just not plant off his foot, but be tackled on his foot and be able to bounce right back up and be able to withstand a lot of carries.
"When we start seeing those things, we'll have a better feel of what type of guy he can be. We're not going to overburden him until he feels he's 100%.
"I can't wait to see what he can do, and I can't wait to see what he can do in our total offense. I keep asking [quarterbacks] Blaine [Gabbert] and Chad [Henne], 'Tell me about MoJo. What's he like in the huddle? What's it like being out there and seeing him hit the hole?' They speak glowingly about him."
The 28-year-old featured in just six games last season, rushing for 414 yards and scoring one touchdown.