The forward has scored 39 goals in all competitions for the Scottish Premiership side.
Sheffield Wednesday boss Carlos Carvalhal is interested in the player on a free transfer.
The Columbus Crew SC striker scored four goals in 25 total appearances for Boro during the 2013-14 season.
Here is how Celtic will line up to face Aberdeen this afternoon.
Vincent Ralph discusses the desire of many to seek out spoilers for Game of Thrones.
The 33-year-old's goal this weekend gave the Black Cats a massive boost in their bid for Premier League survival.
Wolves beat a second-string Sheffield Wednesday side.
A 1-0 defeat to Manchester United on Saturday has left Norwich on the brink of relegation, with the Canaries unable to convert a number of decent chances.
Holding, who has been with the club since the age of eight, has been heavily linked with a move to the Premier League.
The 17-year-old striker replaced Scott Sinclair for the closing stages of Saturday's 0-0 draw with Newcastle United at Villa Park.
Aston Villa had won just one Championship match when Steve Bruce took over from Roberto Di Matteo.
Liverpool are due to face Leeds United in EFL Cup action later this evening.
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Could Tottenham Hotspur manager Mauricio Pochettino take charge of Real Madrid or Barcelona in the future?
Eddie Nketiah scored a hat-trick for Arsenal's under-23 side.
The Tottenham Hotspur youngster looked impressive for the second string this week.
Tottenham tasted defeat during their clash with the Blues, but their former manager has praised two of their stars.
Akpom played under Ibrox boss Mark Warburton previously, while a new striker could feature on Rangers' winter shopping list.
The Tottenham Hotspur winger has everything in his locker to be great, once he learns how to best utilise his skill set.
The Manchester United manager reportedly wants the Chelsea man to free up Paul Pogba.