The game ended 1 - 1 with both goals coming in the final minutes.
Neil Harris scored for Millwall in the 85th minute before Simon Church levelled 2 minutes later.
Stephen Hunt played the opening 45 mins.
Reading: Andersen; Spence, Kelly, Bennett, Pearce; Karacan (Lossaso 80), Sigurdsson (Goddard 60), Henry, Hunt (Hateley HT); Bignall, Church
Millwall: Edwards, Dunne, Craig, Robinson, Whitbread, Smith (Martin), Abdou (Fuseini), Laird, Hackett (Spiller), Harris, Grimes (Forbes).