The Northern Ireland international is a target for Manchester City this year.
They have had an £18m bid rejected as the Baggies hold out for £30m.
And the former Manchester United defender has attracted interest from the big clubs before.
Pulls said: “He had a chance to go to Arsenal last year.
“It didn’t affect him in any way.
“You could say Manchester City are different because they will be hoping to win the title, the Champions league, and the FA Cup. It is difficult.
"They’ve made an offer that we’ve turned down.
“Every player is for sale at the right price, it is absolutely crazy to say that a team like West Brom won’t sell players if people are going to put an enormous amount of money in front of you.
“It is market forces. We don’t want to sell him, or need to sell him, we are not desperate to get the money in, so it would have to be a very, very good offer.
“Then we would sit down and talk to Jonny about the situation.
“It is irrelevant whether he wants to stay or doesn’t want to stay.
“The most important thing is everyone understands he is one of our best players. That is what we’ll try to do, keep him here.
“Jonny’s fine, he understands the situation. Until all parties agree nothing will happen. He is happy here, he’s just been made captain.”
