| Diego Jardel | |
| Fullname: | Diego Jardel Koester |
| Birth Date: | 26 December 1989 |
| Birth Place: | Águas Mornas, Brazil |
| Position: | Attacking midfielder |
| Currentclub: | Londrina |
| Youthyears1: | 2005–2006 |
| Youthclubs1: | Figueirense |
| Youthyears2: | 2007–2009 |
| Youthclubs2: | Camboriú |
| Years1: | 2009–2011 |
| Clubs1: | União Leiria |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 2009–2010 |
| Clubs2: | → Arouca (loan) |
| Caps2: | 5 |
| Goals2: | 0 |
| Years3: | 2012–2013 |
| Clubs3: | Camboriú |
| Caps3: | 20 |
| Goals3: | 3 |
| Years4: | 2012 |
| Clubs4: | → Marcílio Dias (loan) |
| Years5: | 2012 |
| Clubs5: | → Imbituba (loan) |
| Years6: | 2013–2017 |
| Clubs6: | Avaí |
| Caps6: | 121 |
| Goals6: | 10 |
| Years7: | 2015 |
| Clubs7: | → Botafogo (loan) |
| Caps7: | 34 |
| Goals7: | 4 |
| Years8: | 2017–2019 |
| Clubs8: | Al-Arabi |
| Caps8: | 44 |
| Goals8: | 8 |
| Years9: | 2019–2020 |
| Clubs9: | Al Dhafra |
| Caps9: | 24 |
| Goals9: | 3 |
| Years10: | 2020–2021 |
| Clubs10: | Cuiabá |
| Caps10: | 10 |
| Goals10: | 1 |
| Years11: | 2021 |
| Clubs11: | Ajman |
| Caps11: | 7 |
| Goals11: | 3 |
| Years12: | 2022–2023 |
| Clubs12: | Brusque |
| Caps12: | 32 |
| Goals12: | 7 |
| Years13: | 2023– |
| Clubs13: | Londrina |
| Caps13: | 18 |
| Goals13: | 1 |
| Club-Update: | 6 September 2023 |
Diego Jardel Koester (born 26 December 1989), known as Diego Jardel, is a Brazilian footballer who plays as an attacking midfielder for Londrina.
After playing with Camboriú, Jardel joined Avaí in 2013. He played over 50 times for Avaí, including 45 times in the Campeonato Brasileiro Série B. Before the start of the 2015 season, Jardel negotiated a season-long loan with newly relegated Botafogo de Futebol e Regatas.[1] [2] Jardel has returned to Avaí after the end of loan term since 31 December 2015.
On 12 January 2022, he returned to Brazil and joined Brusque-SC.[3]