A contract works both ways - if VVD was to say that he wished to move to Liverpool, and Liverpool matched all terms that Chelsea did, then under contract and employment law they wouldn't have a leg to stand on. Bottom line is, even though VVD has put a TR in, all three parties have to agree a move, not just the two clubs.
Moot point though - VVD will go to Chelsea if they stump up enough money and Soton say they won't listen to any offers from Liverpool.
He can refuse to sign for Chelsea but like Tobes said, identical offers are under no obligation to be accepted.

