Leicester's new signing Dom Barrow will have to wait a long time for his debut after sustaining an ACL injury.
The 22-year-old arrived at Welford Road from Newcastle Falcons before the start of the new season, with the Tigers getting underway against London Irish on October 18.
"Dom arrived from Newcastle with an ACL injury," Cockerill told the BBC.
"It will be Christmas time before he's back."
Jordan Crane and Owen Williams may both be fit for the start of the new season as they continue to recovery from knee injuries.