Millwall midfielder Liam Trotter is on West Ham United's radar.

The People says Hammers boss Sam Allardyce will step up his ­interest in ­midfielder Trotter from the Hammers' bitter rivals Millwall.

Allardyce has been impressed with the £2m-rated ­powerhouse who has been instrumental as the Lions ­challenge for a play-off place in the Championship.

Allardyce would face stiff competition for Trotter who has also been tracked by Everton and Southampton.