Rangers forward Nacho Novo expects to be out of action for up to six weeks.
Nacho Novo has been in good form for Rangers this season
The Spaniard dislocated his shoulder during a friendly with Middlesbrough and is expected to miss the remaining Champions League group fixtures.
Meanwhile, Stevie Smith has targeted a return to training in a month's time after a hernia operation.
The 22-year-old left-back has not played for the Ibrox club since December and has undergone three operations in a year.
Manager Walter Smith told the club website he hoped it was the end of the defender's injury problems.
"Stevie had another operation last week in Germany for a slight hernia problem. It will be another month before he returns to training," said Smith.
Smith said the full-back had visited a number of European countries in the past 11 months seeking specialist advice to tackle his injury problems.