Parry said: "It has to be a concern Stevie would be tempted to move away. You have to be concerned about losing players when you're not successful - and finishing fourth, for Liverpool, is not successful.
"While we're not successful you'd be mad to think we don't have issues with our top players. We can't stop Stevie joining Manchester United or whomever if he really wants to go.
"That's not to say we wouldn't fight tooth and nail to keep him. We would, and I've no doubt his greatest desire is to win trophies here. But ultimately winning trophies - wherever - is what players want.