MARK Warburton says his Brentford side must be prepared tomorrow for a lift in Millwall's performance levels under Neil Harris.
The Lions have been more spirited in Harris' first two games at the helm and Warburton is wary of that bounce continuing at Griffin Park on Saturday.
He said: "We have said all along there are no easy games.
"They are scrapping, they are in the mix at the bottom and will be fighting very hard. Neil Harris has come in with an outstanding reputation there, Millwall's leading goal scorer.
"They will want to play for him. We are aware of the threat they pose and the challenge they offer. If we don't match it we will get punished.
"They have some real strengths. With a new manager there are grey areas but we are at home and need to impose ourselves on the game."