Castleford coach Ian Millward has revealed Rangi Chase was "extremely upset" after the incident that left Featherstone's Tangi Ropati with a broken jaw.
Chase has been banned for three games by the RFL over the incident while Ropati has been ruled out for 12 weeks.
Millward told BBC Radio Leeds: "Rangi was extremely upset and he's tried to make contact with Tangi since.
"He's a fellow countryman and he was quite shaken about it."
He added: "We thought Rangi was guilty and so did he. The decision was fair and we're 100% behind the RFL's verdict."
Meanwhile, Featherstone, who knocked Cas out of the Challenge Cup and have been drawn against current holders Wigan in the next round, have launched an appeal to raise funds for the injured Ropati.
Under the terms of his visa the Samoan can only earn money from playing rugby league.
Fev commercial manager Paul Taylor said: "The club has been inundated with people sending messages of support to Tangi and asking how they can support him during his recovery."