Eunan O'Kane has suffered a recurrence of the injury which saw him miss two months for Leeds United last season.
According to The Yorkshire Evening Post, Leeds United midfielder Eunan O'Kane has been forced to pull out of the Republic of Ireland squad with a groin injury.
The Leeds ace has been in fine form so far this season and has played every minute of the Whites' five Championship games - three wins, two draws.
Overall, the 27-year-old, who missed two months of last season with the same injury and ultimately fell out of favour under Garry Monk, looks a man reborn since Thomas Christiansen has come in and fans of the Elland Road will hope it's a short-term thing.
Leeds, who sit third in the Championship, host Burton Albion in two week's time as the domestic game in England's top two divisions is halted due to the international break.
It's ok. liam Bridcutt is the ideal replacement— Paul Battye (@paulbattye) August 28, 2017
Shame but at least he's not playing with it, hopefully he'll be fresh after break— Olly (@Olly_Ford_) August 28, 2017
Oh no!!! Isn't this how it all went wrong for him last year?!— FionaCK (@FionaCK) August 28, 2017
It's fine that's why we have loads of midfielders, let's just hope it isn't but serious and it's just a caution— Chris cleghorn (@Chriscleghorn4) August 28, 2017
shame for him..unlucky son— danny wilson (@beargryllz) August 28, 2017
Bugger that..— Kildaregaa365 (@kildaregaa365) August 28, 2017
@eunan10 hope this is fixed with rest.. been on fire lately would be a shame if it was a long term thing.— John Stodel (@LUFC_IaMgOdSDaD) August 28, 2017
Hope it's nout serious. Although the strength in depth in midfield is fantastic. Klich is class, Anita is class and Vieira is class.— Harris (@leed5leed5leed5) August 28, 2017
Fortunately for Leeds, Christiansen has Ronaldo Vieira and Mateusz Klich as probable replacements, having sold Liam Bridcutt earlier this month, but it remains to be seen whether the pair - neither of whom have started a Championship game this season - are ready to step in for the Irishman if needed.
United's promotion prospects look a lot brighter than they did at the same point last year and Christiansen will be desperate to see his linchpin shake off his latest setback for the sake of continuity.