Background
Cook was born in York, North Yorkshire.
Cook was born in York, North Yorkshire.
He graduated through the Leeds United Academy and was playing for the Leeds under-18s team when he was just 15 years old.
He has represented England at various levels and is a current England U19"s International. Leeds United
He scored in a 3-1 loss against Liverpool under-18s on 1 March 2013 at Anfield for Leeds under-18s in the FA Youth Cup. = 2014/15 Season After breaking into the side during the 2014-2015 pre season, Cook made his first team debut for Leeds United in the first game of the season, coming on in the 64th minute against Millwall.
Cook made his first start for Leeds on 12 August 2014, starting the League Cup match against Accrington Stanley.
He made his first League start for Leeds on 30 August against Watford. He became one of the first names on the teamsheet for Leeds becoming part of a homegrown contingent in the first team alongside Alex Mowatt, Charlie Taylor and Sam Byram.
On 28 March 2015, Cook picked up an ankle injury on international duty for England U19"s which ruled him out of the final games of the season for Leeds. On 9 April, after rumoured Premier League interest in Cook and teammates Alex Mowatt, Charlie Taylor and Sam Byram, Head Coach Neil Redfearn challenged Leeds United"s owners to keep a hold of their home grown talents.
= 2015/16 Season On 11 May 2015, Cook signed a new contract at Leeds, keeping him at the club until the summer of 2017.
On 12 August 2015, Cook scored his first ever Leeds goal against Doncaster Rovers in the League Cup, Cook was also sent off in the first half for a straight red card, with Leeds eventually losing 4-2 on penalties after a 1-1 draw. As a result of his first ever Red Card, Cook received a suspension of 3 matches. After being subject to bids from Premier League clubs, On 7 January 2016, Leeds Manager Steve Evans revealed that Leeds had rejected bids for Cook and that President Massimo Cellino had assured him that Cook would not be sold.
In August 2014, Cook was called up to the England under-18s for a match against the Netherlands.
In March 2015, Lewis was called up to Sean O"Driscoll"s England under-19 squad to face Denmark, Azerbaijan and France in the last three remaining European Under-19 Championship qualifiers. Cook had to withdraw from the squad on the 31st of March after suffering an ankle knock in training meaning he missed the match against France as the Young Lions looked to secure a place at the summer’s showpiece tournament in Greece.
On 19 April, Cook cemented his place as one of the top prospects outside the Premier League when he won the Football League Championship Apprentice of the Year Award for the 2014/15 season. On 1 May 2015, Cook was named as the Runner Up to Winner Alex Mowatt in the Yorkshire Evening Post"s Player Of The Year for the 2014/15 season. On 2 May 2015, Cook won the Young Player Of The Year Award and also finished as runner up to Alex Mowatt in the Fans Player Of The Year award at Leeds United"s official end of 2014/15 season awards ceremony. In May 2014, Cook was part of the England under-17 squad that won the Union of European Football Associations European Under-17 Championship, starting three of England"s five games including the semi-final and the final. He made his debut on 28 March, playing 79 minutes against Azerbaijan in a 1 – 0 win for England before being replaced by Charlie Colkett of Chelsea.
