Leeds United v Middlesbrough: The opposition in focus

Three to watch:

Britt Assombalonga: Since Middlesbrough broke their transfer record to acquire the services of Assombalonga he has scored 17 goals in 52 appearances for the Teessiders. In a move worth £15 million he joined the club on a four year deal signing from fellow Championship promotion hopefuls Nottingham Forest. In his first season at Boro he notched up 15 goals and was top scorer. He begins his second campaign at Middlesbrough hoping to reach the 20 mark. Whilst at Forest he scored 30 Championship goals in 47 games. Twenty-five-year-old Assombalonga is a talented player with power, pace and precison. His goal scoring prowess will leave Marcelo Bielsa conjuring up ways to keep him quiet. Pontus Jansson v Britt Assombalonga will be a great battle to watch and a much anticipated one.

Aden Flint: Flint was Middlesbrough's second summer signing joining from Bristol City. Flint is regarded as one of the best central defenders in the league and Boro did well to fight off interest from elsewhere, including Leeds United. Flint is always a danger from attacking set pieces and throughout his time at Bristol City he scored 38 goals for the Robins. Flint is also effective defending set pieces and is usually the one to clear and intercept crosses in the penalty area. Flint was a pivotal player in Bristol City's historic Carabao Cup run last season where they reached the semi-finals beating Manchester United in the previous round. Flint has started all of Middlesbrough's league games this season and is a crucial part to their promotion bid.