Havertz ruled out for season as Arsenal confirm hamstring surgery

"Subsequent assessments and specialist reviews have confirmed that the injury will require surgery, which will take place in the coming days. Soon after surgery, Kai will begin his recovery and rehabilitation programme, which is expected to extend into pre-season preparations for next season," Arsenal confirmed in a statement.
Recovery from a hamstring surgery typically ranges between 16 and 29 weeks, meaning Havertz is set to miss not only the remainder of this campaign but also part of Arsenal's pre-season preparations.
The 25-year-old has been a key figure for the London outfit this campaign, contributing 15 goals and five assists in 34 appearances. His absence leaves Arteta with a significant gap to fill as the Gunners continue their fight for silverware.