The MLS summer transfer window, also known as the secondary window, will extend into September for the 2026 season, continuing an ongoing push by the league to coincide with the schedule of global soccer.

Summer window will now extend into September, helping clubs add talented players in their run to the Audi 2026 MLS Cup Playoffs MLS announces several amendments to the 2026 Roster Rules and Regulation

For once, Major League Soccer got it right. A league that barricades itself behind a TV paywall … constantly overhauls its playoff format … relies too heavily on past-their-prime foreign stars … thumbs its nose at FIFA’s international windows ...

Major League Soccer has instituted a significant change to its scheduling format, and it could have a huge impact on Chicago Fire FC fans. Under a proposal that was approved on Thursday, the league will transition to a summer-to-spring scheduling format ...