Key player Dean Heffernan returns from suspension for the important second leg of the A-League semi-final against Queensland roar tomorrow night.

28-year old Heffernan served a two-match ban after receiving a red card in the Round 20 clash against Melbourne Victory but will be straight back into the Mariners starting eleven.

"I'm very excited to be getting back to playing, it's been a couple of weeks since my last game, so I'm really looking forward to hopefully getting a run," said Heffernan.

"I really do think that Queensland are going to be under a little bit of pressure, they're at home and they'll most likely have a big crowd there.

"We've got as good a chance as any to come back from this deficit and if we can make the most of our opportunities early on in the game, it could really change the way that things pan out."