Nick Pope has joined Bury on loan until the end of the season.
The move follows the arrival of Serbia U21 international goalkeeper Marko Dmitrovic, and a permanent deal for Neil Etheridge, previously of Oldham.
"Popey has gone until the end of the season to hopefully chase promotion," goalkeeping coach Ben Roberts told Charlton's official website.
"We see him as an asset to Charlton and spending the second half of this season on loan was always part of the long-term development plan we have in place for him.
"He got his chance sooner than expected this season due to Stephen (Henderson's) injury and generally did well."
Pope has this season featured eight times for Charlton.
Bury, meanwhile, are a point outside of the League Two play-off places.
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