Coyle is on the standby list for several clubs this summer as the managerial merry-go-round waits to start, but Gartside feels he will win the fight to keep the man he tempted from Burnley in January 2010 - unless a giant steps in.
Gartside revealed to the People: "If Manchester United or someone like that came on the phone, I would say 'Right, I will drive you there to meet them'.
"I am not frightened about what might happen and losing Owen. I can't stop him. But it would have to be a hell of a job to interest him.
"If he gets targeted by the type of club I think will come for him one day, he would go with our blessing - and he would also have brought us success in the meantime.
"He is young, he has got a great career in front of him. Owen has a vision of what he would like - young players, good football, enthusiasm at all levels."