In particular, the 2019 summer window saw Leeds United have a clear out – with ten players leaving the senior squad as Marcelo Bielsa looked to help the Whites to their long awaited return to the Premier League.
We take a look at the 17 departures and where they are now below...
7. Tom Pearce
Tom Pearce signed for Wigan Athletic from Leeds United on deadline day of 2019. The defender struggled for game time in the Championship but became more of a regular following Wigan's relegation to League One. Photo: Stephen Pond
8. Bailey Peacock-Farrell
Bailey Peacokc-Farrell joined Burnley from Leeds United in 2019 to provide competition for Nick Pope. The goalkeeper made four appearances in the Premier League last season before being sent out on loan to join Sheffield Wednesday this summer. Photo: Alex Livesey
9. Caleb Ekuban
Caleb Ekuban joined Trabzonspor permanently in 2019 after enjoying a loan spell with the club the season before. The striker has now switched Turkey for Italy, joining Genoa earlier this month. Photo: FADEL SENNA
10. Aapo Halme
Aapo Halme joined Barnsley in 2019 and has remained in Yorkshire since, making over 50 appearances for the Tykes. The defender received his first senior Finland call-up in May of this year. Photo: Julian Finney
11. Pontus Jansson
Former fan favourite Pontus Jansson joined Brentford in 2019 and has since been an ever-present figure in the Bees' defence. The centre-back guided Brentford to the Premier League last season as club captain and will lead them out against the Whites in December. Photo: Shaun Botterill
12. Jack Clarke
Jack Clarke showed a lot of potential during his time at Leeds United and was soon snapped up by Tottenham Hotspur in 2019. The winger has since had three loan spells - a return to Elland Road, a short spell with QPR then the second half of last season with Stoke City. Photo: Gareth Copley