Charlton boss Karl Robinson says Patrick Bauer left the Valley on crutches wearing a protective boot following the 2-2 draw with Peterborough.
Bauer hobbled off early on in the second-half after injuring his leg.
He is set to join Jason Pearce, Tariqe Fosu, Chris Solly, Ben Reeves, Lewis Page and Billy Clarke on the treatment table.
MORE: Robinson believes Charlton will get better after Peterborough draw
Young defender Anfernee Dijksteel replaced Bauer for his Addicks league debut and impressed at right-back.
When asked about the extent of Bauer’s injury, Charlton manager Robinson said: “We don't know yet.
“He’s in a boot and crutches.”
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