To futher my point, neither Arsenal nor Chelsea can make the homegrown quotient without including thier under 21's. There's a lot of veteran depth on United and even the under 21's are stronger than the other two.
Arsenal:
Homegrown: Nicklas Bendtner, Gael Clichy, Denilson, Johan Djourou, Cesc Fabregas, Vito Mannone, Alex Song (7)
Others: Manuel Almunia, Andrei Arshavin, Marouane Chamakh, Abou Diaby, Emmanuel Eboue, Lukasz Fabianski, Laurent Koscielny, Samir Nasri, Tomas Rosicky, Bacary Sagna, Robin van Persie, Thomas Vermaelen, Sebastien Squillaci.
(Arsenal can also use young players including: Theo Walcott, Jack Wilshere, Kieran Gibbs, Carlos Vela, Emmanuel Frimpong, Aaron Ramsey.)
NB: Arsenal have only 20 senior players over 21 and can make up their homegrown quota through youth players
Chelsea
Homegrown: Ross Turnbull, Ashley Cole, John Terry, Frank Lampard
Others: Petr Cech, Henrique Hilario, Branislav Ivanovic, Jose Bosingwa, Paulo Ferreira, Yuri Zhirkov, Alex, Michael Essien, Ramires, John Obi Mikel, Yossi Benayoun, Florent Malouda, Salomon Kalou, Nicolas Anelka, Didier Drogba.
(Chelsea can also use young players including: Patrick van Aanholt, Jeffrey Bruma, Josh McEachran, Gael Kakuta, Daniel Sturridge, Fabio Borini.)
NB: Chelsea have only 19 senior players over 21 and can make up their homegrown quota through youth players