Sunderland have completed the signing of Jeff Whitley signed.
Whitley has been training with Sunderland
Whitley, 24, has agreed an 11-month deal after being released by Manchester City.
Whitley, 24, has been training with Sunderland since April and has played a key role in the club's pre-season campaign.
"Jeff is a good player who I'm sure will do well for us," said McCarthy.
"I've made no secret of my desire to sign him and I'm glad it's all gone through."