"Murph's going nowhere," Keane told the Sunderland Echo.
"We're always looking for positives and Murph is certainly one of them. From the day I first arrived in the job here, we've had lots of inquiries for him.
"Sometimes other clubs make your decisions for you because if they're always asking then you think the player has something about them.
"Last year we were still sussing players out and he did well for us.
"He's a good lad and a good professional. He's in the next Irish squad and is getting his rewards with a run of games. He's taking his chance in the side."