Charlton boss Chris Powell has confirmed that Federico Bessone will be out of action for "a number of weeks".
The on-loan Leeds left-back sustained a hamstring injury in last weekend's 3-2 win over Peterborough and is now facing a lengthy spell in the treatment room.
Bessone is one of three players currently on loan at The Valley and Powell is keen to bolster his squad.
"It's something we've been trying to do," he told Charlton's official website.
"We've made a few phone calls because I still feel we need to add to the squad.
"Sometimes you lose out to Championship clubs when players have that option. It's an ongoing process for us and we'll endeavour to get the right players to join us."