Such a move would mean that MLB is following a variation of the National Football League model as it restructures its marketing and business operations. The NFL has a president that answers to the commissioner, but its NFL Properties division has its own president. It's expected that MLB will make the move official by Labor Day but that Mr. Kantarian wouldn't assume his new duties until January. Sports marketing executives also expect Mr. Kantarian to try to lure key marketing executives away from rival sports leagues, most notably the NFL, where he used to work. Neither MLB nor Mr. Kantarian would comment.