Brendan Rodgers has revealed Liverpool will check on the fitness of Daniel Agger ahead of the Reds' trip to Old Trafford to face Manchester United on Wednesday night.
Agger was withdrawn in the 57th minute during the 1-0 defeat against Southampton at Anfield on Saturday.
Rodgers explained how the centre-back will be assessed over the next 24 hours to see if he can figure in the Capital One Cup third-round clash.
"We'll see how he is for the game [against Manchester United]," Rodgers told reporters gathered at Melwood.
"He could be a doubt for that game as he has not quite recovered. We wanted to give him time at the weekend, but unfortunately he was struggling with his breathing because he got a knock to his ribs.
"But we'll see. He's a player who makes a good recovery and we'll see over the next 24 hours how he gets on for the game on Wednesday."
Agger was replaced by Jose Enrique during the weekend's defeat against the Saints - and Rodgers was also quizzed on the fitness of the Spaniard ahead of the trip to United.
"We've had to taper his load in training because he's had this niggle now for a few weeks and obviously we're in a period where we have three games this week," said Rodgers.
"We decided to miss him out at the weekend to allow him to be involved over these next couple of games.
"It was just unfortunate that Aly Cissokho was out with injury or else he would have been able to step in and Jose might have been able to rest that wee bit more.
"But he's training and he's fine. We just need to protect his load and the last thing we wanted to do was lose him."