Raiders co-captain Jarrod Croker doesn't envy Stuart's decisions as the Green Machine potentially welcome back halfback Aidan Sezer (oblique) for their crucial clash against the Parramatta Eels at Canberra Stadium on Sunday.

There's also the question of how Joe Tapine (thumb) slots back in - on the edge or through the middle?

The Raiders are looking for their third straight win when they take on the Eels and they go in knowing Canberra Stadium has been a fortress against Parramatta raids over the past 13 years - 2006 was the last time the blue and gold won there.

But Stuart needs to decide how he will tinker with a winning side.

Williams has worn the No.7 jersey the past two weeks, guiding them around the park to beat Newcastle and North Queensland, but Sezer has been named on an extended bench and Croker said he was close to a return.

It's an injury Sezer carried into the opening two rounds before the Raiders opted to give him time to recover.

"I'm not sure [about Sezer]. He's done a lot of the work so far, he's pretty close to being right," Croker said.

"I don't know whether he's 100 per cent or he's 90-95. He'll probably have to get through a lot of contact and wrestle to make sure he is right because it was a pretty painful injury.

"We'll have to see what happens. Fortunately it's not my headache to worry about.

"It's just a great position to be in - we've got two halfbacks, we've got backrowers and frontrowers pushing for spots."

Williams wasn't sure what his role would be come Sunday.

Sezer trained with the team on Thursday, but also did a session i the afternoon that Williams wasn't a part of.

But it doesn't change the way Williams prepares. His only thought is that he's playing and looking to guide the Green Machine to their third straight win.

"I'm pretty comfortable with whatever happens. I always prepare to play, " he said.

"If something changes so be it, but I'm ready to play and my heads around playing and getting out there on Sunday, and everything that needs to be done to try and get the win.

"That's the only thing that I'm focused on at the moment and other people can worry about other players within the squad.

"There's too much going on to be worrying about everything and it's just important that you're ready to go come Sunday."

There are similar questions around how the forward pack will line up, with Stuart already opting to give rookie Corey Horsburgh a rest after playing the opening four rounds.

Tapine felt he would likely form part of the middle rotation, but he could also slot onto an edge.

The Raiders have three world-class second-rowers, with England's Elliott Whitehead and John Bateman named there to face the Eels.

But Tapine could also slot in there, with either Whitehead or Bateman able to switch to lock.

Tapine said the number of thumb and hand injuries he's had were frustrating, but he felt it was just down to bad luck.

"It's all good. I've done my wrestle and contact all through the week. I was testing it out last week and I thought I'd give it another week - I don't want to rush back and do more damage," Tapine said.

"I'm easy [where I play. Maybe I'll] come back into the game in the middle and get my lungs blowing because it's been a couple of weeks.

"I'm just looking forward to being back out with the boys. They've been playing good footy the last couple of weeks and it's been enjoyable to watch. I just want to be a part of it."