Speaking ahead of tomorrow's trip to Stevenage, McCarthy told reporters: "Cressy will still be out as will Ty Mings. He has done some damage to his ligaments and will be out for three weeks."
McCarthy also suggested that he would shake up his team as the league is the priority.
"The league is the priority, of course, but don't let that fool you. I want to win every game and tomorrow is no exception," he added.
Ipswich's season got off to a losing start as they gave up a one-goal lead at the Madejski Stadium to go down 2-1.