Are you worried? I'm not. The clauses are there incase a bigboy is interested, West Ham and Man City can bid for Owen and Martins all they want IMO. They'll be pissing into the wind.
In Owen's case yes. If Martins is offered a big pay rise to move south where lots of his buddies probably live, who's to say?
Owen isn't going to move to West Ham or Man City, not in a million years. He wants a move to a CL club. Same goes for Martins i think, if he was to leave he would want a step up probably to a club in Italy, also he seems alot more committed than Owen.