El-Hadji Diouf remains on collision course with Sam Allardyce and has been left out of the Bolton squad against Charlton on Saturday.
The Senegal striker claims he has not fully recovered from a double hernia operation and cannot play at the moment.
Allardyce is angered by Diouf's attitude and has told him to 'grit his teeth'.
The Bolton boss said: 'He will not figure for the weekend. He is still saying he is feeling something wrong with his hernia.
'We had it checked out and we cannot see any problems. The specialist says there is nothing they can do.
'It has moved around to a mental problem that he has in terms of gritting his teeth and going through a little bit of the pain barrier.
'He is not able to be selected and this is disappointing.'
With four games remaining, Bolton are still clinging to hopes of a UEFA Cup place for a second successive season.
Allardyce added: 'Hopefully Diouf can make a contribution before the end of the campaign.'
Defender Tal Ben Haim is available to face Charlton after sitting out the draw at West Ham through suspension.