The Panthers have reworked the contract of offensive tackle Matt Kalil by converting his $10MM option bonus into a signing bonus, according to Field Yates of ESPN.com (Twitter links). As Yates indicates, converting an option bonus into a signing bonus doesn’t change much about Kalil’s contract, except to ensure that he receives the $10MM immediately. Additionally, while the Panthers could not recoup any portion of an option bonus were Kalil to retire or be suspended, the club could recover Kalil’s signing bonus if need be.