Demba Ba, Hatem Be Arfa, Robben, Ganso, Torres, Gerrard, Ferdinand, Lovenkrands, Walcott, Ledley King, Van Nistelrooy, Obasi, David Dunn, Forlan and Adriano are the ones i've found that are constantly injured.
Generally players over 33/34 usually start picking up injuries, Play them when needed and don't play them against physical teams (Everton, Stoke and Chelsea)