Aaron joined the Clarets for an undisclosed fee from Everton in January, 2018, signing a deal for an unspecified length.
The England international ended a two-and-a-half-year stay at Goodison Park, following a successful loan spell on Merseyside from Tottenham Hotspur during the second half of the 2014/15 season, to become the Clarets’ first permanent signing of the mid-season transfer window.
Before joining Everton on a three-year deal in September, 2015 Lennon spent a highly productive decade with Spurs, having started his career with hometown club Leeds United.
The Yorkshireman came through the youth system at Elland Road before becoming the then-youngest player to appear in the Premier League when he made his first-team debut at the age of 16 years, 129 days in August, 2003.
Following Leeds’ relegation and a season in the Championship, Lennon moved to White Hart Lane in June, 2005 to start a 10-year stay with Spurs, which saw him make 364 appearances for the North London club.
He helped Tottenham secure eight top-six finishes in the Premier League, as well as winning the 2008 League Cup final and reaching the quarter-finals of the Champions League in 2011 under Harry Redknapp.
After joining Everton, initially on loan, Lennon played a key role in helping Roberto Martinez’s side pull away from relegation trouble to finish 11th in the Premier League, the place they occupied again in 2015/16 after Lennon had joined on a permanent basis.
He played a total of 77 games for the Toffees - scoring nine times - including 19 appearances this season as a team-mate of former Burnley defender Michael Keane.
Lennon has also been capped 21 times by England, playing in both the 2006 and 2010 World Cup finals.
One of his two caps for England ‘B’ was won in an injury-curtailed appearance for Steve McClaren’s side in a 3-1 win over Albania in May, 2007 at Turf Moor.
Back at Burnley as a player, Lennon quickly became a key member of Sean Dyche's squad, making his full debut at the start of February and then starting every game for the remainder of the campaign as the Clarets finished seventh in the Premier League.
He was also a regular at the start of the 2018/19 season - scoring his first goal for the Clarets in a home win over Bournemouth - until a knee injury at former club Tottenham just before Christmas ended his season.
Lennon was back in full training before the end of the campaign, however, and triggered a contract extension to remain with Burnley for 2019/20.