The 22-year-old took a knock when trying to reach a Djibril Cisse strike last Sunday, and Royals boss Brian McDermott has confirmed he will be out for "a little while"
The 22-year-old shot-stopper was involved in a collision with the frame of the goal when trying to save QPR striker Djibril Cisse's shot during last Sunday's 1-1 draw at Loftus Road, and manager Brian McDermott has confirmed he faces a spell on the sidelines.
"Alex has seen a consultant, he has a shoulder joint problem and will be out for a little while," McDermott was quoted as saying on the club's official website.
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His spot in the side is now likely to be handed back to Adam Federici, who was dropped in favour of McCarthy after a number of errors during the early part of the season.