Västerås SK has bought Jonathan Karlsson from Hammarby after exercising the purchase option in the agreement. Karlsson had previously been on loan at Västerås SK. The contract with Västerås SK runs until 2029. Mikael Hjelmberg commented that the combination of competition and injuries was decisive in the decision to loan out Karlsson and that Västerås SK activating the option is a positive outcome for all parties.

Billy Magnusson, Västerås SK's sporting director, has stated that the club and Jonathan Karlsson, who is on loan from Hammarby, have an agreement regarding what a potential transfer would involve. Magnusson also stated that a purchase option is included in the agreement with Hammarby. The loan agreement with Västerås SK expires at the end of November this year, and a final decision has not yet been made. The 22-year-old has a contract with Hammarby that is valid until 2029.

Hammarby is set to loan Jonathan Karlsson to Västerås SK, with Sportbladet reporting that the loan agreement has been finalized and is expected to be officially announced soon. Jonathan Karlsson, who has a contract with Hammarby until 2029, is being loaned out as the club's sporting director, Mikael Hjelmberg, reportedly expressed confidence in Karlsson's abilities but acknowledged the necessity for him to be loaned out to gain more playing time. All parties have reportedly agreed to the terms, and the loan is expected to proceed unless unforeseen circumstances arise. Västerås SK, currently in a competitive position in Superettan with the same points as second-place Kalmar FF and just one point behind league leaders Örgryte IS, views the loan as beneficial. It will allow Karlsson to gain valuable playing experience while helping to strengthen Västerås SK's squad during a crucial part of the season.