Does a team need more than 25 players over 21?

[drivin_me_nuts]

OK, so i'm not a big football fan and I caught this on the news yesterday that some in the Premiership are not to pleased at their squad size being limited to 25 over 21's and 8 homegrown players.

Naive question here - other than 'cos we can', is there a logical reason why a team might need/want to have more than 25 players?

[sleep envy]

League, league cup, fa cup, euro comp

that's an awful lot of games over a season...

[spikeyhead]

You need some back up to allow for injuries. it's not unusual for a club to have 10 players that aren't fit.