Nicky Butt believes that Manchester City's midfielders could prove to be the difference during this evening's Manchester derby at the Etihad Stadium.
The former Manchester United midfielder has suggested that the Red Devils are in danger of being "outnumbered" in the middle of the pitch.
"I'm concerned about the United midfield being outnumbered," Butt told BBC Sport.
"City are very strong in there and I think United will have to match up with them."
United head into the match top of the Premier League table and three points ahead of their rivals.
