Arsenal boss Arsene Wenger admits their clash with Manchester United is a must win.

After defeat at Liverpool, Wenger admits his side have put themselves under pressure with the performance as their title credentials are now being doubted.

"It raises questions that we have to answer on Wednesday night," said the Frenchman.

"But it is not what people say it is how we respond what matters.

"People of course raise questions but we have only one way to answer that and it is on Wednesday night."