The most you can hold on T11 is 22.
I currently have 20 players in my squad - that's the figure I always try to keep to so I can bring in my free youth player to sell plus have a spot free if someone great becomes available or if I am struggling to sell someone.
With that said, I only ever carry 1 Goalkeeper as I have yet to see a Keeper get sent off or even booked in this game yet, so my keeper plays every game and gets healed every time he gets injured (which I've only seen happen when training, which I do very little of unless power training at the start of the season)
-----------------------------------------------------------------------------------
Two interesting things to note about my team today -
My wage bill sits at 32M per day now. It was 35.2M yesterday, but its decreased even though I've now got 19 scouts and 1 nine star player. I assume (but cant remember) that when my wages were taken yesterday I had a full roster of 22 players, so it cost more as I had more players, even though they were worse.
The other thing to note is that the two spare cones that Hayden Foster got yesterday have now been allocated to him - so he is now 195 Quality and technically a 10 STAR player - although he is only showing as being 9 star. Again, he gains 0 if I train him now or if he plays in games. The only time he gets improvements is through MOM and Daily Gift (if he is lucky to be the chosen player for that cone).