The Indian transfer window came to an end on October 20. What this meant was that the Indian Super League (ISL) clubs cannot anymore sign players who are not free agents.
However, the ISL registration window ended on October 23. So if a club had to sign a free agent then they should have done so and get him registered by October 23.
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Squad Regulations
An ISL side can register a maximum of 35 players in their squad.
The clubs must bear in mind that they must have at least six and not more than seven foreign players in their squad.