Ben Foster has undergone surgery to repair a ruptured ligament in his right thumb, which means Ben will play no further part in the current campaign, reports the Manchester United website
The 26-year-old England international goalkeeper will be out for at least nine weeks before targeting a return for the Reds next season.
"It is big blow for Ben as not only will he miss the Champions League final but also England's summer internationals," Sir Alex told ManUtd.com.
"Ben has tried to continue the season with this injury but it got so critical that an operation was the only way forward.
"It is disappointing for him but the important thing was to get this operation done."