Charlton have decided not to offer a contract to Tyrone Mears but have yet to come to a conclusion over Adam Matthews.
Lee Bowyer and his staff were trialling both right-backs at the club for the past two weeks.
Mears, 36, a former teammate of Bowyer, has been told he will not be offered a deal and has left the club.
Former Sunderland and Cardiff man Matthews, 27, however remains at the club on trial and is still in contention to earn a contract the Addicks boss said.
“Tyrone has gone now, but Adam is still here,” Bowyer said ahead of his trip to Reading on Saturday.
“We played a game on Tuesday and he did well.
“We won’t jump too far ahead but we’re pleased with his progress.
“He hasn’t done a full pre-season, so won’t be too harsh in judging him but he’s done well.”
Bowyer has been in the market for a right back sin Afernee Dijksteel’s £2million move to Middlesbrough in the summer.
Chris Solly and Deji Olishaja have both filled the role but with the latter primarily a centre back, Bowyer is keen to recruit a specialist right back.
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