Kevin Stewart is set to spend a spell on the sidelines with a serious ankle injury sustained in first-team training earlier in the week, Jürgen Klopp has revealed.
The 22-year-old's maiden league cameo was reward for his rapid rise through the Reds' ranks since returning from a loan spell at League One's Swindon Town, but in the club's latest injury setback, the holding midfielder could be out for a lengthy spell.
Stewart was expected to make his European debut for the club in their UEFA Europa League Last 32 first-leg clash with FC Augsburg on Thursday night, despite being unregistered, but was unable to fly out to Germany because of his injury.
He picked up the knock after attempting to block a shot and rolling the ankle, with Klopp revealing that the club's medical staff are fearing ligament damage.
Reds boss disappointed with Stewart injury
"We lose Kevin Stewart in training," admitted the German, who explained that he "blocked a shot and his ankle was not stable."
He further said that Stewart's ankle "was a bit bruised" and said they have "sent him for a scan" to reveal the full extent of the problem, though he admitted: "We think it's the ligament."
Klopp rued that the youngster has "trained outstandingly" and said: "Then this happened" and accepted that it's "not too good" for the team given his recent form for the senior side.
Issuing a full fitness update, Klopp also admitted that Lucas Leiva will be back into the side for their trip to Germany to take on Bundesliga outfit Augsburg after a slight hamstring knock.
However, Adam Lallana's calf problem will keep him out after he missed their win at Villa, with Klopp saying that Lucas "is back fit" but that the Englishman "has no chance for Thursday's game."