As of my last knowledge update in January 2022, I don’t have specific information about the mentioned decision made by Chelsea manager Mauricio Pochettino regarding Ian Maatsen’s loan to Borussia Dortmund in January. However, it’s common for football clubs to loan out young players to gain more playing experience and develop their skills.
It seems that Mauricio Pochettino believes that the loan move to Borussia Dortmund will be beneficial for both Chelsea and Ian Maatsen. Loan spells can provide young players with valuable playing time, allowing them to mature and develop their abilities in a competitive environment.
For the most recent and accurate information on this matter, I recommend checking the latest sports news updates, Chelsea’s official announcements, or reputable sports journalism sources for any developments or statements made by the club and manager after January 2022.