Scimeca has returned successfully from a year long lay off when it was feared he would never play again, so this is a real blow to him and the club.
Dave Jones confirmed: "Riccy has ruptured ankle ligaments and will be out for two months, maybe more.
"It's a tough blow to have one long injury, work your way back and then suffer an injury again.
"I will be working with the chairman to bring a midfield player in on loan.
"That won't be before the transfer window closes but it will be during September."
Championship sides are allowed to loan players 1 week after the transfer window closes.