Millwall boss Neil Harris dismissed his team's chances of reaching the play-offs despite moving into contention in the Championship.
Millwall climbed into the top half of the Championship after coming from behind to beat Sheffield Wednesday 2-1.
Millwall are again expected to weigh up Tim Cahill's fitness ahead of the Sky Bet Championship match against Sheffield Wednesday.
Rochdale booked their place in the fifth round of the FA Cup with a 1-0 win against Championship side Millwall at the Crown Oil Arena.
Reading's Sky Bet Championship relegation fears worsened when they were beaten 2-0 by Millwall in a scrappy contest at Madejski Stadium.
Reading could hand on-loan striker Chris Martin his debut in the Sky Bet Championship clash against Millwall.