Johnny Sexton is in the mix to be fit for Leinster's Heineken Champions Cup semi-final with Toulouse this weekend, after the club confirmed he will return to full training this week.

The Ireland out-half had been suffering from a quad issue and was previously withdrawn from the side that defeated Ulster in the quarter-final as a precautionary measure.

His return would be a timely boost for Leo Cullen's charges as they look to keep their European title defence on track.

Elsewhere, Tadhg Furlong is expected to train this week and be available for selection after he was withdrawn during the second half of Leinster's heavy defeat to Glasgow Warriors.

"They're both good," said the province's senior coach Stuart Lancaster. "We've got training this afternoon so Johnny will be training, there's no issue with him. Tadhg was withdrawn as a precaution but we're confident he'll train tomorrow.

"The big thing is losing the likes of Dan Leavy and Josh Van Der Flier. Mick Kearney has dislocated his shoulder but overall, we're not in bad shape for finals rugby and that's where we are."

Remarking on the challenge that awaits Leinster at the Aviva Stadium on Sunday afternoon, Lancaster said that this is the biggest game of their season.

"Without a doubt. Any semi-final in any competition... it's knockout rugby. For us, we need to be at our best. We've high regard for their coaches and players. Their track record over the last eight or nine games has been outstanding.

"They had an amazing win at the weekend against Clermont, so we've very high regard for them. It'll be an exciting game for them in terms of the Aviva because they play some unbelievable rugby."

Leinster inflicted a 16-point defeat on their French opponents when they collided at the RDS back in January, while Toulouse got the better of the Irish province when they met last October.

"You take bits out of every game. The bits out of the game away from home, we gave them an early start. We played catch-up rugby, we got into a lead and they got an intercept and won the game. Memories of that still linger in the mind.

"The game at the RDS was a great win for us to get the four tries so we'll look at that, but more importantly, you look at the more recent games and what they've done over the last month. You build your analysis and preparation on that as well."

Rory O'Loughlin is also due to return to full training this week after recovering from a hamstring problem.

Leinster take on Toulouse this Sunday at 3.15pm in the Aviva Stadium. 

Follow Munster v Saracens (5.30pm, Saturday) & Leinster v Toulouse (3.15pm, Sunday) via our live blog on RTÉ.ie/sport and the News Now app.

Listen to live national radio commentary of Leinster v Toulouse on RTÉ Radio 1's Sunday Sport.