West Ham boss Sam Allardyce has told Manchester City they will always struggle to match Manchester United so long as Sir Alex Ferguson in the manager at Old Trafford. "You're always chasing the master and he has been the master for so long - it is difficult to sustain success against him," Allardyce said.

"Whenever he has a challenge, he may lose out once, but he comes back with flying colours. He's had it with Chelsea and before that Arsenal."