McCarthy played in the 1-1 draw at the Estadio da Luz on Sunday but was taken off in the second-half, marking the third successive match without a goal after a run of free scoring form.
The match finished with a cheeky solo effort by Juninho, who again capitalised on loose man-marking by the Manchester defence to squeeze off a shot from the top left edge of the area that beat Bosnich at the right post.