Major League Soccer's Primary Transfer Window officially opened on Wednesday.
With both the start of preseason and opening day (April 17) delayed, the Primary Transfer Window dates were amended last month, with the window now open from March 10 through June 1, almost a month longer than planned. The Secondary Transfer Window remains the same, opening on July 7 and closing on August 5.
- Primary Transfer Window: Wed., March 10 – Tues., June 1, 2021
- Secondary Transfer Window: Wed., July 7 – Thurs., August 5, 2021
The transfer windows are the periods in which MLS teams can officially register any new players who were previously under contract with clubs based outside MLS and for which an International Transfer Certificate (ITC) is required. While deals may be agreed upon outside these windows, the transfer and receipt of an ITC are required in order to officially add a player to a roster, thus allowing him to be eligible for official competitions.
All in-season trades between MLS clubs must take place within these transfer windows.