The official Twitter account of the NHL's department of Player Safety tweeted Friday that it would announce the length of Thornton's suspension on Saturday for his attack on Penguins defenceman Brooks Orpik last week.
Thornton had an in-person disciplinary hearing Friday with NHL officials.
He hasn't played since last Saturday, when he went after Orpik during a stoppage in play, slew-footing him to the ice and punching him twice in the head during Boston's 3-2 win over the Pittsburgh Penguins at TD Garden.
Orpik suffered a concussion and was taken off the ice on a stretcher and transported to the hospital.
The NHL Player Safety department also tweeted that Toronto's David Clarkson will have a hearing on Saturday for his illegal check to the head of St. Louis forward Vladimir Sobotka during the Leafs' 6-3 loss on Thursday.
Clarkson received a two-minute minor on the play.