He has been referred to an RFL disciplinary panel along with York City Knights’ Liam Harris who is also up on the same charge after they were sin-binned for fighting in Sunday’s friendly between the teams.
Clare, 30, knows the grading could result in a suspension of anything from three to five matches.
Castleford only have one more friendly - at Doncaster on Sunday - before their Super League opener against Salford Red Devils on Friday February 11.
Tigers forward Nathan Massey was handed a Grade A dangerous contact charge by the match review panel following an incident in the same game but received a zero penalty notice.
York were not as fortunate; their major signing Pauli Pauli received a two game penalty notice for a Grade B dangerous contact meaning he could miss their Championship opener against Featherstone Rovers on Monday January 31.
York’s Jacob Ogden was also handed a one match penalty notice for a dangerous contact while Halifax’s Jacob Fairbank was given the same suspension for a late hit in his side’s friendly with Wakefield Trinity.