Rooney went down under challenge from Steven Caulker with United 1-0 up.
"It was as clear a penalty as you're going to get," Michael Carrick told MUTV. "We're disappointed with that because it would have put us in a great position. Big decisions like that can change games and today it did."
Carrick's team-mate Rio Ferdinand concurred, "One hundred per cent, it was a penalty. I can't believe he didn't give it. The linesman didn't really help us on that side [of the pitch] at all during the second half. We're disappointed the referee didn't give what was a stonewall penalty."