Mackay is hopeful that the deal will go through soon.
"We've had a bid accepted. Tom's been on holiday and we're going to be talking to him in the next couple of days," he told talkSPORT.
"It's something that we're very keen to push forward. He's a very young exciting player.
"He needs to play football and that's something his father and I both realise."
Ince scored 18 goals in 47 appearances for Blackpool last season.