The Boston Red Sox may be seeking additional compensation from the Chicago Cubs after righthander Chris Carpenter underwent elbow surgery.
The Boston Herald, citing a team source, reported that the Red Sox do not consider the trade talks closed.
After months of haggling, the Red Sox and Cubs agreed on Carpenter and reliever Aaron Kurcz as compensation for signing Theo Epstein as team president in Chicago.
On Thursday, Boston also sent Jair Bogaerts to the Cubs as the player to be named later.
At issue for both teams is whether Carpenter was injured before joining the Red Sox. He made only two appearances in spring training.
Carpenter has bone spurs removed from his elbow, and posted on Twitter that the procedure went "great."