Police are investigating a series of death threats made to the Reading players involved in incidents in which Chelsea keepers Petr Cech and Carlo Cudicini were injured.
Ibrahima Sonko and Stephen Hunt have received the threats in letters sent to the club’s training ground.
Thames Valley Police said: “The club is helping us with our inquiry and the matter is being investigated.”
According to the Reading Chronicle newspaper, one letter said: “We are going to kill you for what you did to our players.”
Reading players regarded the first letter as a joke and pinned it up on the door of the training ground dressing-room, but when further threats arrived the police were called in to investigate.
Cech is not expected to play again this season after fracturing his skull in a first-minute collision with Hunt in the game at the Madejski stadium.
Cudicini was stretchered off in a last-minute collision with Sonko, although his injury was not as serious as Cech’s and he has recently returned to action.
Winger Hunt, on international duty with the Republic of Ireland, said: “The club is dealing with all my letters and I don’t want to say any more.”
A Chelsea spokesman added: “There is nothing to suggest these threats came from genuine Chelsea fans.
“Naturally, we condemn any threats of this nature and we will assist the police fully if – and we stress if – there is any evidence linking theses threats to any of our supporters.”