Date of birth
A Manchester United academy graduate, the 28-year-old brings a huge amount of Championship experience to Kenilworth Road, having spent a majority of his career in the second tier.
After he made two appearances in the League Cup, Tunnicliffe left Old Trafford in 2014, having spent time on loan at Peterborough United, Barnsley and Ipswich Town, joining Fulham for an undisclosed fee in 2014.
He spent three-and-a-half years there, again, heading out on loan, this time to Blackburn Rovers and Wigan Athletic.
He joined Millwall in 2017, spending two-years there, before joining the Hatters in the summer.
Tunnicliffe made 40 appearances during his first season at Kenilworth Road, scoring his one and only goal in the 1-0 away victory against Middlesborough.
He played a further 28 games in all competitions during the campaign after, in which he scored in back-to-back wins against Sheffield Wednesday and Nottingham Forest.