Newton has accepted the three-match ban handed out for the stiff arm that knocked out St Helens second rower Lee Gilmour in last Friday's 38-12 home defeat.
But he is contesting the lengthy suspension imposed by the Rugby League's disciplinary committee on Tuesday for the challenge that left Long with a fractured cheekbone and eye socket damage.
In a statement, Newton said: "I have pleaded guilty in respect of the Lee Gilmour tackle but I have also apologised for that.
"I am equally sorry for Sean Long who received an injury following my collision with him. He is a Great Britain team-mate and I do not enjoy seeing him injured.
"At the same time I want to make it absolutely clear to everyone that I did not tackle Sean with any intent to cause injury. I tackle aggressively and did so on this occasion but my sole intention was to use my shoulder and sadly Sean was injured, but I stress it was not my intent.
"I hope Sean soon recovers but I must appeal and I want to sit before the panel and tell them what happened."
Long has been ruled out of the engage Super League play-offs and will almost certainly miss the Gillette Tri-Nations Series.
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