Arsene Wenger has warned Manchester City their biggest tests are yet to come as Arsenal look to knock the Barclays Premier League leaders out of the Carling Cup.

Big-spending City have romped to the top of the table, where they hold a five-point advantage over Manchester United following a 1-1 draw at Liverpool. Roberto Mancini's men are already being lauded as champions in waiting, many suggesting they could emulate Wenger's Invincibles team of 2003/2004.

However, Wenger said: "You have to go through the whole winter when you play in the Champions League - we did that. In the FA Cup as well, the semi-finals of the Champions League - to do that together is very difficult. It [an unbeaten league campaign] looks unlikely, but you never know. You can never really doubt."

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