Doubts over State of Origin duo Ash Harrison and Greg Bird have not stopped Gold Coast teammate Scott Prince seeing the funny side of Friday night's crunch NRL clash with Canterbury.

Prince would be forgiven for being a worried man ahead of their showdown - game two of a Suncorp Stadium doubleheader.

There are concerns over Queensland lock Harrison (shoulder), while NSW forward Bird is battling to back up following Wednesday night's Origin I.

It's the last thing the battling Titans need after learning Blues' hooker Michael Ennis will bolster the Bulldogs.

But towering Canterbury centre Jamal Idris looms as the biggest headache for Prince - literally.

Prince expects to be left black and blue by Idris, as the dreadlocked strike weapon vies for an Origin II NSW jersey.

And he couldn't wipe the smile off his face over the prospect.

"I have no doubt he will be lining me up - I just have to hold onto his locks and enjoy the ride," Prince laughed.

But the Titans' plight is no laughing matter for Prince.

After the Titans (14th; 3-7 record) lost two straight before their last-round bye, coach John Cartwright is doing some major tinkering.

Prince is expected to switch from halfback to pivot, regular five-eighth Will Zillman to fullback and Preston Campbell to swap the No.1 jersey for No.7.

"We talked a bit (with Cartwright) about what was best for the team but only time will tell (if the switch works)," Prince said.

"It gives us another attacking point, we spread the kicking game a bit and Zilly can still have a ball-playing role."

In another surprise, young hooker Matt Srama is on standby as an injury cloud hovers over Harrison and Bird.

"You would have to say they (Origin duo) are in doubt, but we will see how they pull up tomorrow," Cartwright said.

The Titans will need all the help they can get against what looms as an Idris-inspired Bulldogs.

It will mark the first time Idris lines up against the Titans since announcing he will link with the Gold Coast on a lucrative deal from 2012.

"Jamal gets a chance tomorrow night to show what he can do and, if he can perform like he has in the early stages of the year, there's no reason why he won't throw his hat in the (Origin) ring," Bulldogs' coach Kevin Moore said.

But Ennis' injection might prove the difference as Canterbury (8th; 5-5) try to snap a three-game losing run.

"Having Mick back is a real bonus for us," Moore said.

"I think our halves last week got a little bit lost without Mick there, and I expect our attack to be a lot better.

"There's been a lot of positives over the last few weeks, even though we've come up with those losses.

"It was only two weeks ago that we really tested the premiers (St George Illawarra)."

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