Former Chelsea player Kai Havertz once again became a key figure as Arsenal defeated his old club, with former Blues winger Joe Cole publicly criticizing the club's decision to send him to a direct competitor, saying it was "not good enough."
Former Player Turns Against Old Club

Havertz played an important role in Arsenal's win over Chelsea, and this was not the first time the former Chelsea player had caused problems for his old club after returning to face them. Chelsea were initially satisfied with the transfer fee they received from selling Havertz to Arsenal, but he has now made his former club pay a price.
Joe Cole said on a Premier League program: "If you have Kai Havertz at your club, you would be watching him every day and every week. Managers and head coaches come and go, but what about the sporting director? Look at how much the club has spent on the striker position since he left."
Kevin De Bruyne Cited as Previous Example
Cole continued by pointing out that similar situations had happened before: "This is really not good enough, and I think it has to stop happening. It happened when Kevin De Bruyne left, and it has happened with Kai Havertz leaving as well."
He also compared the situation with the way business was handled during the eras of Ferguson and Wenger: "These kinds of deals never happened under Sir Alex Ferguson at Manchester United or under Arsene Wenger at Arsenal. When did you ever hear of them letting a player go and then seeing that player develop into a world-class player at a rival?"
Possible Explanation from Chelsea
Chelsea's sporting director could potentially defend the decision from two perspectives. First, comparisons with Ferguson and Wenger are no longer fully applicable in today's football environment, as financial regulations and the transfer market have changed significantly compared with their managerial eras.
Second, selling Havertz was a decision made under pressure from his high wages as the club rebuilt the entire squad and operating model. The issue was not that they considered Havertz not good enough, but that his salary could not fit within the club's wage limitations.