New signing Jamie Young has been injected into Brisbane Roar’s FFA Cup round of 16 clash with Adelaide United after keeper Michael Theo’s injury.

New signing Jamie Young has been thrust into A-League champions Brisbane Roar’s FFA Cup round of 16 clash with Adelaide United on Tuesday night after goalkeeper Michael Theo suffered a training injury.

But Roar coach Mike Mulvey has confirmed captain Matt Smith has overcome a groin complaint.

Former England youth international Young has been unexpectedly handed his competitive debut for Brisbane after No.1 gloveman Theo succumbed to a wrist complaint at Monday’s training session.

The full extent of Theo’s injury is yet to be determined but a Roar official believed his withdrawal is more precautionary.

Young only joined the club in the off-season but the 29-year-old played almost 250 matches during a 13-year stint in England before signing with the three-time A-League champions.

It is believed Brisbane are trying to register goalkeeper coach Jason Kearton as a squad player for back-up.

Meanwhile, Mulvey said Smith was given the green light after passing a fitness test before the team flew out on Monday for the clash which will seal a quarter-final berth in the inaugural knockout tournament for the winner.

Smith had missed the club’s double header against Central Coast Mariners and Brisbane City 10 days ago.

He also sat out last week’s training game against Palm Beach Sharks, in which Brisbane prevailed 9-0.

“He had a tightening of the groin area just over about a week ago but he’s trained strongly … (but) Theo will stay behind – we’re not risking anyone,” he said.

Mulvey said the FFA Cup clash would be a timely hit-out before they host Adelaide United in the A-League’s opening round in less than three weeks.