England captain Steven Gerrard admits supporters have every right to vent their frustration over the Rio Ferdinand saga.
Manchester United defender Ferdinand was recalled by national coach Roy Hodgson for a 2014 World Cup qualifying double-header with San Marino and Montenegro.
He was drafted back in after a spell in the international wilderness, but ended up pulling out of the squad citing a pre-planned training regime which had been agreed with his club employers as the reason behind his decision.
Ferdinand then fanned the flames further by jetting out to Doha to cover the San Marino game as a television pundit, and saw sections of the travelling England support single him out for terrace taunts.
Gerrard understands the fan angst, but insists the players remain fully focused on the task in hand - with England striving to book their place at next year's tournament in Brazil.
He said: "I think the fans have shown their frustration about Rio not being here. They're entitled to t...