PFA chairman Clarke Carlisle has launched a sensational attack on both Rio and Anton Ferdinand after they ignored the Kick It Out racism demonstration launched back in October 2012.
Both brothers refused to wear Kick It Out t-shirts after they were left unhappy at the length of the bans received by John Terry and Luis Suarez for their alleged racial abuse of Anton and Patrice Evra, respectively.
Carlisle was adamant that the actions of both men in boycotting the group were damaging to the entire campaign, and lambasted both in his upcoming autobiography, serialised in the Daily Mail.
He said: "It p****s me off that, rather than speaking out and addressing the topic, a few decide to do something as trivial as not wear a t-shirt, then melt back into the crowd.
"Jason (Roberts) apart, the Premier League 'big' players happily throw in a grenade, but do nothing when it explodes, nothing other than appear to hide behind their advisers.
"That's because they are s***houses. They have made their 'statement' for all to see, but how many are prepared to stand in front of the cameras and be counted?"
The ex-defender, who retired this summer, is a huge ambassador of the Kick It Out campaign and was furious at the refusal of top black players to assist with raising the profile of the group.
He added: "I could count on my fingers the guys who have been to the KIO [Kick It Out] and Show Racism the Red Card workshops and meetings.
"It seems like they can't be arsed to join in, because it's inconvenient to attend on a day off or to contribute something after training."