Nathan Cleary suffered a compound ankle fracture in a hip-drop tackle during Newcastle's preliminary-final win over Penrith.
Cleary underwent surgery and said Monday that Phoenix Crossland had apologised after contacting him.
Crossland's Grand Final hopes ended when he pleaded guilty to dangerous contact.
Sent off on Sunday, he has since faced abuse on social media.
The Match Review Committee referred him directly to the judiciary, viewing the tackle as worse than Grade 3 dangerous contact given Cleary's injury.
Officials' decision to send him off reflected their view that it was the worst hip-drop tackle in NRL history.
Media reports said Crossland pleaded guilty rather than contesting the charge to preserve his Grand Final chance.
The judiciary will decide his sanction after hearing evidence on Tuesday evening.
A Grade 3 penalty could exceed four games; an early guilty plea reduces the sanction by one game.
Crossland is likely to miss New Zealand's entire Rugby League World Cup campaign, where he was due to partner Dolphins hooker Jeremy Marshall-King.