Here, we take a look at Kristensen's career so far:
7. May 2019
Kristensen lifts his first silverware, winning the 2018/2019 Eredivisie title with Ajax after playing 616 league minutes over the course of the 2018/2019 season. Photo: Dean Mouhtaropoulos
8. June 2019
Kristensen represents his country at the European Under-21 Championship. Twice, the defender captains Denmark but his side fail to qualify from Group B. Photo: Alessandro Sabattini
9. July 2019
Kristensen departs the Johan Cruijff Arena after just 18 months with Ajax and joins RB Salzburg, where Jesse Marsch has just taken charge, for a reported fee of £4.5m. Photo: Dieter Nagl
10. September 2019
On his full Champions League debut, Kristensen celebrates with fellow debutant Erling Haaland who bags a hat-trick as the Red Bulls thrash Genk 6-2 in a Group E clash. Photo: KRUGFOTO/AFP via Getty Images
11. October 2019
Kristensen takes instructions from RB Salzburg boss during a 4-3 Champions League defeat to Liverpool at Anfield. Photo: Paul Ellis
12. July 2020
Kristensen lifts the Bundesliga trophy with RB Salzburg. The full-back only contributed 12 league appearances as the second half of his season was blighted by a hamstring injury. Photo: Barbara Gindl