Charlton skipper Johnnie Jackson will require a scan on a hamstring injury sustained during Saturday's 1-0 win at Brentford
The winger, who has scored eight goals this season, could be facing a spell on the sidelines after he pulled up during the League One tie.
"Obviously he's not very good," said manager Chris Powell afterwards.
"It's very early to predict but when a hamstring goes you are never back within a few days, that's for sure."
Jackson could now miss next Monday's top-of-the-table clash with Huddersfield.