• Rooney picked up ankle injury during draw with Bolton • Striker went off during second half at the Reebok Stadium

Wayne Rooney has been ruled out of Manchester United's Champions League game against Valencia on Wednesday due to an ankle injury picked up during yesterday's draw against Bolton Wanderers.

Sir Alex Ferguson has told club officials the 24-year-old will not be fit enough to make the trip after being withdrawn during the second half of yesterday's game.

It is unclear how long Rooney will be out for, but he could possibly miss United's trip to Sunderland on Saturday, while England will hope the striker will be able to participate in their Euro 2012 qualifier against Montenegro on 12 October.

Some may feel it is a good time for Rooney to have a break. On ESPN yesterday, the pundit Kevin Keegan voiced his concern for the striker, who has scored only one goal for United this season, a penalty against West Ham United.

Meanwhile Nemanja Vidic has told his team-mates to cut out the defensive lapses that are wrecking their title bid. United have conceded nine goals in five Premier League games so far this season, and are three points behind the leaders, Chelsea.

"It is a big concern that we are conceding so many away goals," said Vidic. "We have to stop doing it. We cannot let it happen again.

"Over the last few years we haven't given that many goals away or even allowed them so many chances. Before we have always looked strong, so this is not what we are used to. We have to play much better in our away games."