Celtic goalkeeper Artur Boruc has undergone knee surgery which will keep him out for at least three weeks.
The Poland international has missed Celtic's last three matches with a thigh injury, so the club decided to put him in for the operation to fix an ongoing knee problem.
The surgery took place after Celtic were granted permission by UEFA to involve back-up goalkeeper Dominic Cervi for the Europa League clash in Hamburg on Thursday. The American was not in Celtic's 25-man squad for the competition but he will be on the bench in Germany as Lukasz Zaluska continues in goal.
Manager Tony Mowbray told the Evening Times: "We would not have agreed to Artur having the operation if the clearance for Dominic had not been granted.
"Now the hope is Artur will be back in time for the league game against Dundee United in three weeks."
Boruc will definitely miss the Clydesdale Bank Premier League trip to Falkirk on Sunday, but the Tannadice clash on November 22 is Celtic's next match after that.
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