When does the transfer window open?

Is it just after Masters ends or after champs? Or somewhere in between?

After Champs, which is the end of the vct season.

capital_d_colon [#2]

After Champs, which is the end of the vct season.

early september is it?

Yup

Earthspirit [#3]

early september is it?

The VCT 2023 pre-season transfer window will opened on September 26, 2022 and closed on February 1, 2023.

I would expect VCT 2024 to follow a similar timeline.

But yeah sometime after September the 11th (which is when the season ends)