Liverpool manager Roy Hodgson has questioned the professionalism of Barcelona-bound midfielder Javier Mascherano.
The Argentine has come in for criticism after, at late notice, he failed to make himself available for the Reds' 3-0 loss against Manchester City on Monday.
Barca have since had an offer in the region of £16million accepted by Liverpool, with Mascherano poised to wrap up his wanted move in due course.
Hodgson, who took over at Anfield this summer, has admitted he has been let down by the player's attitude.
"It is not easy for me to defend the actions (of Mascherano) because professionals are paid to play and when they are called on to play, they play," he said.
"We had a player at Blackburn, Graeme Le Saux, who was very agitated when I joined the club because he was determined to go to Chelsea and that caused a lot of problems in pre-season.
"Tim Sherwood was wanted by Tottenham and that caused a lot of problems because he wanted to get back to London.
"These situations do occur unfortunately and we have to live with it.
"I don't think they (the players) mean it as a challenge to your authority or a challenge to the club's authority.
"It is just a selfish situation that they have got something they want to do and they just expect the club, and therefore you as one of the leaders of the club, to bow down and accept that they are going to do it.
"Unfortunately there are going to be periods of time when there will be some unpleasantness because players must also understand that when you sign contracts you sign contracts to play.
"If the club decide they are going to accept an offer for you and let you go that is one thing, but you run the risk the club might say 'I'm sorry, you've got the contract and we aren't selling you so you are staying'.
"It doesn't bother me as a challenge to my authority it is just a fact of life.
"But it is a fact of life which gets exacerbated in a one-month period in January and between July and August when it is a time of year when a lot of people are trying to do their business."