Steven Watt has returned to Chelsea from his month-long loan spell at Barnsley.
Boss Andy Ritchie said: " He was playing in some discomfort, so he will go back to get himself fit.
"But we have an agreement to take him again in January if we want to, and they can let him out."
Watt, 20, made three appearances at Oakwell, but his form was hampered by a groin injury. He scored in their 1-1 draw with Rotherham.