The former Wolverhampton Wanderers and Norwich City manager is favourite to succeed Carlos Carvalhal at Sheffield Wednesday.
Bournemouth look set to beat Nottingham Forest to the 20-year-old's signing.
Bournemouth have reportedly entered the running to sign the Nottingham Forest target from Blackburn Rovers.
It looks to be a straight choice between Middlesbrough and Nottingham Forest for Blackburn's Connor Mahoney.
The former Aberdeen winger was hotly linked with a move to Forest, but recently signed for Celtic.
Blackburn Rovers starlet Connor Mahoney is in demand with Middlesbrough joining Nottingham Forest, Wolves and Celtic in the mix.
The Blackburn Rovers winger has been earmarked as a target for Mark Warburton.
The Blackburn Rovers winger, coupled with Hibernian star Jason Cummings, has shown a clear shift in transfer policy from last season.
Nottingham Forest look set to beat Celtic and Wolves to the signing of Blackburn Rovers winger Connor Mahoney on a free transfer.
Gary Mackay-Steven could be replaced by Blackburn Rovers winger Connor Mahoney at Celtic - and vice versa.