James Ryan is in line for a Leinster return for Saturday's Heineken Champions Cup quarter-final against Leicester.
The Ireland second row has been out of action since suffering a concussion during the Guinness Six Nations clash with England on 12 March.
It was the 25-year-old's seventh head injury assessment (HIA) in a 15-month period.
"He’s available, he’s trained," senior coach Stuart Lancaster confirmed to RTÉ Sport.
"He’s had a graduated return-to-play, obviously a lot more extended than you would normally give a player, given the fact it was a while ago that he left the field the last time.
"He’s good, he’s training well and he’s in the mix."
Charlie Ewels was sent off for his high challenge on Ryan was just one of a number of players who have been red or yellow-carded for dangerous tackles recently.
It’s an area that World Rugby are trying to improve and Leicester’s Ollie Chessum (above left) is available on Saturday (5.30pm) after undertaking "intense coaching education around height of play" that reduced his suspension following a red card against Clermont in the round-of-16.
"Yes, he took the World Rugby course," Tigers boss Steve Borthwick said.
"Obviously, everything has to go through all the regulations and paperwork."
Leinster centre Robbie Henshaw said players must be extra vigilant not to fall foul of the clampdown, which saw five players dismissed over the course of the URC champions recent three-match run against Connacht.
"When you are in team training it’s very hard to drill it," said the 28-year-old Ireland international.
"It comes down to individual technique and being able to drop that body height. It is evident now in every game, either a yellow or a red, it’s so frequent now. Just one lapse in concentration and you can cost your team.
"It’s definitely down to the individual and a lot of us do individual work pre-training and post-training, just making sure you are focusing solely on technique.
"A lot of time it comes from fatigue and you go high because you are blowing [hard] and not thinking.
"Everyone knows it now, it’s all on us."
Leinster centre Robbie Henshaw looks ahead to the @ChampionsCup quarter-final #LEIvLEI #RTERugby #RTESport pic.twitter.com/BMg86xcjga— RTÉ Rugby (@RTErugby) May 2, 2022
The 2018 winners have been also boosted by the return to fitness of hooker Ronán Kelleher (shoulder) and second row Ryan Baird (back), while James Tracy (neck) is out and Max Deegan (shoulder) will be assessed during the week.
Follow Munster v Toulouse (Saturday 3pm) and Leicester v Leinster (5.30pm) via our live blogs on rte.ie/sport and on the RTÉ News App. Listen to Munster v Toulouse on RTÉ Radio 1.