Wests Tigers coach Tim Sheens admits he has some thinking to do ahead of Sunday's NRL clash with South Sydney after the loss of centres Dean Collis and Chris Lawrence as well as prop Bryce Gibbs.

Collis was ruled out for up to six weeks on Thursday after breaking his arm in a training drill with Dene Halatau earlier this week and will join Lawrence (ankle) on the sidelines, leaving Sheens with a selection headache in his back line.

"With my two starting centres out it has really thrown a spanner in the works," said Sheens.

"Dean Collis is out for 4-6 weeks and undergoing surgery and Chris Lawrence is in a (protective) boot for four weeks so that's taken a bit of strike from our game.

"We will have had to reassess .. and work out what we are going to do with our centres and that is something I will have to make a decision on later in the week."

The injury to Gibbs was also sustained in training when he hurt his shoulder during a tackling session, but will only keep him out of action for a week, but it denied him the chance to make his 100th first-grade appearance for the club.

Despite the loss of three key players, Sheens said he is excited at the prospect of playing at the Sydney Cricket Ground for the Heritage round showdown with Souths.

He also said he no problem with the club's status as the nomads of the NRL with the SCG being the Tigers' fourth different home ground already this season.

"In a one-off game the excitement factor will be good for both clubs but I suppose you could call it a loss of home advantage," he said.

"But we get to train on it and they don't and we did have a win there last year against Souths ... so it is not that we are totally foreign with it and won't have to prepare for the game any differently."

Tigers skipper Robbie Farah also said he was looking forward to playing at the SCG after missing his side's 30-10 win the corresponding fixture last year.

"It is always good to play on grounds like the SCG especially with this year being the 40th anniversary of the grand final between the sides," he said.

"I am a bit of a footy nut so those places are special to play at for myself."

Farah revealed some of the club's legends would be speaking to the players before the game and hoped it would have a similar effect to Artie Beetson's wise words ahead of the recent win over Melbourne.

"Some of the old guys will be coming into training on Saturday," he said.

"Before we played the Storm Artie Beetson came down and had a few words and it hit the spot so hopefully it can have the same effect."

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