Gold Coast Titans veterans Preston Campbell and Luke Bailey have been given until the last minute to prove their fitness for Sunday's NRL clash with Newcastle at Skilled Park.

And the jury is still out on when skipper Scott Prince will return from a hamstring complaint, despite receiving encouraging scan results.

After both Bailey (ankle) and Campbell (heel) failed to train with the team on Thursday, Titans coach John Cartwright said the pair would be given until Saturday to overcome injury.

Cartwright was already assessing his options, with youngster Kayne Lawton - who has only played one NRL game - a possible replacement for Campbell in the halves.

"We've got young Kayne there and we'll just decide if we slot him in at the deep end or bring him off the bench," he said on Thursday.

But Bailey was confident he would be running out alongside Campbell against the Knights.

"I think I'll play, I haven't tested it out as yet but I've given it plenty of rest because it's been a long week," Bailey said.

"It's been getting better every day. I had a bit of a run on Monday and it wasn't too flash but Tuesday, Wednesday and today it's starting to feel a bit better.

"It wasn't a serious injury just something that needed a bit of time.

"I'm not getting any younger so it just needed time to heal and it's feeling pretty good."

Bailey said Campbell was "in the same boat".

"The more rest the better, but just having a chat to him I think we're both pretty confident of playing," he said.

Campbell has been named at No.7 for Prince who was expected to only miss the Knights clash before returning in a fortnight's time following their next round bye.

It was encouraging news after initial fears Prince could be sidelined for up to six weeks with the injury suffered during last round's 25-24 win over the Bulldogs.

But Cartwright was uncertain whether Prince would return against the Wests Tigers in round 18.

"He's back running and whether he gets back (in round 18) for the Tigers game or not I'm not sure," Cartwright said.

"William Zillman will be at fullback this week and we'll wait and see if Preston is OK on Saturday."

Lock Ashley Harrison, who suffered a gash under his eye in Queensland's historic Origin II victory, will return for the Titans on Sunday.

"He's nice and refreshed ... we're fortunate we got through last week and didn't have to use him and he's had a good 10 day rest and can't wait to get back out there," Cartwright said.

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