The 20-year-old was previously a promotion winner with MK in 2018/19 when he ended the campaign on loan with the then League Two side.

Walker, whose Boro debut came in August 2018 in the Carabao Cup, made his first Championship appearances for the club during the first half of last season, when he featured seven times during Jonathan Woodgate’s tenure as head coach.

He was again loaned out for the second half of the season when he completed another League Two promotion for Crewe Alexandra, scoring once in six appearances.