Chelsea boss Di Matteo questions Suarez Liverpool equaliser
Di Matteo suggested it should have been disallowed for a Luis Suarez push on Ramires.
"It was a poor goal to concede," he said.
"We had our man marking the opposition and Ramires was with Suarez and he pushed him away to create that bit of space for himself to nod the ball in.
"Sometimes the refs notice, sometimes they don't. It's one of those."