The current max squad size is 22.
Why you need 22 players in your squad, for what? I don't think somebody need 22 players, maybe only if you will play DL-DC-DR + ML - MC - MR + (DMR/DML) or (AML/AMR/AMC) + 1/2 Strikers to need 1 substitution for all players but 90% of teams have at least 2 MC or 2 DC and then 1 subts. is ok, same for strikers.
@ثائر طه , you can have more then 22 (24 or 26 if I am not wrong) players, but you won't be able to play with them, they will appere on your team but they won't have a signed contract, you will need to sack or sell players till you will spaces for them, but yes "signed players" you can have only 22cheer!