An Arsenal player from the age of nine, Jack missed almost the whole of last season through injury, but returned to fitness in time to help the Gunners secure a second-place finish in the league.
The midfielder was also called up by England for Euro 2016, and played in three out of the four games at the tournament. He played a major part in getting England to the finals, scoring twice in the crucial win over Slovenia in November 2014.
Combative with impressive levels of stamina and a fine passing range, Jack is comfortable in a wide variety of midfield roles.
Now with more than 100 Premier League appearances to his name, he became the Gunners youngest-ever league player when he made his debut at Blackburn in 2008, aged 16 years and 256 days. He's also the youngest player to represent Arsenal in European competition, at 16 years and 329 days.
Capable of scoring outrageous goals, he won BBC Match of the Day's Goal of the Season competition in successive campaigns - for his effort against Norwich City in 2013/14 and the screamer against West Brom in 2014/15.
An FA Youth Cup winner in 2009, he was loaned to Bolton Wanderers for the second half of the 2009/10 season and the following campaign was voted as PFA Young Player of the Year.