Garry Ringrose, Charles Ngatai and Tommy O'Brien face a race to be fit for Leinster’s Investec Champions Cup final against Toulouse on Saturday.
Ireland centre Ringrose has not played since an appearance as a substitute in the Six Nations win over Scotland in March as he recovers from a shoulder injury.
Prior to that he had last played for Leinster at the end of January.
"Garry will continue to be assessed this week for a shoulder injury before a final decision is made on his involvement against Toulouse," said the province, looking to equal Toulouse’s record of five European Cup wins.
The 29-year-old was pictured smiling at Leinster’s training session in UCD on Monday afternoon and assistant coach Robin McBryde was asked about the co-captain’s workload.
"The medical team, they’re probably just stepping things up. To what intensity I couldn’t tell you but it’s step by step and just assessing it as he goes," said the former Wales international.
Backs Ngatai and O’Brien picked up shoulder and hamstring injuries respectively in Saturday's 23-21 URC defeat to Ulster, and the duo will be assessed during the week.
Lock James Ryan, full-back Hugo Keenan and flanker Will Connors all came through the game with no issues upon their returns from injury.
They lost the last two by one score to La Rochelle.
"We’ve had to work bloody hard to get here again," added McBryde.
"There are a lot of good teams in the competition and we’ve had to fight to get to this stage.
"If we wanted a reminder that it’s not going to be handed to us on a plate then Ulster gave us that little reminder at the weekend.
"It was good to get a shot across the bow just to focus the attention a little bit more.
"You’ve got to go out there and get your stuff right."
Leinster beat Toulouse in their last two semi-finals, by 19 points last year and by 23 points in 2022.
Asked how much was to be read into those games, McByde said: "It wasn’t that long ago we played them and certainly I don’t think their DNA has changed with regards to how they play the game of rugby.
"That’s pretty ingrained in them. They’ve got a pretty settled coaching group and they are very comfortable and successful with the style of rugby they play.
"It’s always good to have a little look back. It wasn't that long ago but this time it’s a final and there’s a lot to be gained and a lot to be lost."
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