Rooney says Man Utd up for derby clash
United defeated West Ham United 2-0 in London on Saturday.
"I thought we played some really good stuff, moved the ball well and counter-attacked really well so we're really pleased with the win," he said.
"The Olympiacos game gave us a big lift in confidence and belief as well in ourselves.
"This was a good result for us going into the derby so we're looking forward to an exciting game and hopefully get a good result."