Charlton spokesman Andrew Mills said: "It looked as though the deal was done, but Leeds were uncomfortable with the recall clause we were keen to implement so, regrettably, it did not happen."
Meanwhile, Andersen felt Leeds used the clause as an excuse in order to opt against the deal and instead secure Fulham's Tony Warner for a longer period.
"It is simply not right," explained Andersen to BT. "At first, Leeds had accepted the clause. The clubs had agreed, but I got the impression that the club wanted to get Tony Warner from Fulham and used the clause as an excuse. But I am almost certain that I will be playing for another club before the leagues restart after the international break."