Brumbies fly-half Christian Lealiifano's long-anticipated comeback from his leukaemia scare has been delayed after he suffered a pulled hamstring.

Lealiifano was expected to make a return in the Brumbies' clash with the Reds in Brisbane on Friday night but pulled up in training on Wednesday with the injury.

“He tightened up at training yesterday and a couple of days out from the game there’s no point risking it,” Larkham told the AAP.

Lealiifano was diagnosed with cancer last year and underwent a bone marrow transplant in November.

While the hamstring injury is not serious, if no progress is made in the coming days the 29-year-old could also miss the Brumbies’ final regular season game against the Chiefs in Hamilton next week.

“We’ll just see how he pulls up. If he doesn’t loosen up over the next couple of days then maybe not,” Larkham said.

Even if he doesn’t play in the last round of Super Rugby, Lealiifano is still in contention to feature in the Brumbies’ home quarter-final against either the Hurricanes or the Chiefs on July 21.

“If his body’s right and his mind’s right, he’ll be available for selection,” Larkham said.