Charlton have accepted a written transfer request from left-back Paul Konchesky "with considerable reluctance."
Konchesky is seeking a move to a bigger club to further his international ambitions
The England Under-21 captain has been frustrated by the lack of first-team opportunities in his preferred position of left-back with Charlton boss Alan Curbishley keeping faith with 34-year-old Chris Powell.
The 22-year-old made his full England debut as a second-half substitute against Australia and has targeted a place in Sven-Goran Eriksson's Euro 2004 squad.
"I feel I have a realistic chance of getting to Euro 2004 and if I have to leave Charlton to do that, then I have some very difficult decisions to make.
"It is not a decision about money, it is purely a football decision based on football reasons.
"I could have waited until the start of the season to make the decision but I thought that would be unfair on the club. I have told Alan that while I am at Charlton I will remain 100% committed to the cause."
Konchesky's advisor Andrew Mills reiterated the player's wish to develop at international level.
"Paul has made no secret of his desire to continue his progression on both the domestic and international stage," said Mills.
"Euro 2004 is a realistic ambition for him and, after appearing in a variety of positions on the left-hand side last season, he needs to be able to contest his preferred position of left back on a regular basis.
"We spoke to Alan Curbishley earlier in the season with regard to Paul's growing frustrations and he asked us to put off any decision until the end of the season.
"The position was discussed again at the weekend and, with Alan's knowledge, we have subsequently handed in a written transfer request."
Konchesky made his Charlton debut as a 16-year-old and has made more than 100 first-team appearances for the Addicks.