Ciarán Frawley won't be available for Leinster this weekend, but fellow Ireland internationals Jack Boyle and Jimmy O’Brien trained with the team on Monday afternoon.
Out-half Frawley was replaced after 55 minutes of Ireland A's defeat to England A in Bristol on Sunday after suffering a head injury.
Frawley, who has eight Ireland caps, has yet to feature in the Guinness Six Nations after three rounds.
"He’s recovering well but I’m not sure where he’s at in terms of the return to play protocols.
"He won’t be available for us this weekend."
Ireland winger O’Brien, who also hasn’t played in the Six Nations so far, and prop Boyle (below), who made his Ireland debut in the win over Wales, were pictured training with Leinster earlier today.
"Boyler’s a great character and we’re all really pleased to see him get his cap over in Wales," added the New Zealander.
"You might have seen the song he sung after the game. He’s a good character, the guys love him, he brings a good energy but does the job on the field.
"We’re really excited, hopefully he gets back playing with us shortly. It’s great to see him in the Irish colours doing really well."
Tommy O’Brien, Max Deegan, Stephen Smyth, Paddy McCarthy, Conor O’Tighearnaigh, Alex Soroka and Fintan Gunne were also in action in Bristol on Sunday with Bleyendaal adding "most of the other [A] guys are back in the building, looking excited and energised to be back with Leinster."
Meanwhile, Leinster out-half Harry Byrne (above), who is on a short-term loan deal with Bristol Bears, also suffered a head injury soon after coming on as a replacement in the game.
The loss of two out-halves in just over half an hour of rugby appears to have justified Leinster’s stance when questions arose about the 'logjam' in that position.
Sam Prendergast, 22, has started the last five Ireland Tests and all four of Leinster’s Champions Cup pool games.
Ross Byrne, it was announced last week, will join Gloucester at the end of the season after spending 10 years at Leinster, playing 177 times and winning 22 Irish caps.
Former Munster out-half Bleyendaal said: "You can always have a surplus in any position and then you seem to get hit with an injury crisis and you’re scrambling for high-quality players.
"The frustration comes, I guess, when you’re not getting opportunities at game time.
"We’ve probably seen that with the 10s that were in the building, and especially at the start of the year, so you get a few injuries and guys are out for a short or an extended period of time and it is great to have high-quality players that can roll in and keep the game flowing.
"You can’t always have that luxury but I feel like we have that with the 10s."
On Ross Byrne (above), Bleyendaal added: "He has got an important role.
"Ross has played the most or almost the most minutes for us this season so he has had a lot of involvement, and he is really important to how we drive the game both on and off the field.
"He does a great job for us and we’re really excited for him to have another opportunity but not until we finish our season.
"He has plenty more to do for us. He is still contributing and staying positive and we’re looking forward to seeing what he can do again."
Table-toppers Leinster will welcome back Rob Russell, while Cormac Foley is out with a calf injury. Jordie Barrett, who sat out the 22-19 win over Ospreys in round 11, is available.
Elsewhere, former New Zealand centre Ma'a Nonu (above) has joined Toulon in a surprising comeback, the French club said on Tuesday, with the 42-year-old arriving as medical cover at the Top 14 side.
Nonu, who earned 103 caps with the All Blacks and won the Rugby World Cup in 2011 and 2015, played in Toulon from 2015 to 2018 and during the 2020-21 season.
Toulon are second in the Top 14 standings, three points behind reigning champions Toulouse with nine games remaining. They also play Saracens in the last 16 of the Champions Cup in April.
Additional reporting: Reuters
