(MIAMI, FLA) – It’s a mystery but, Miami quarterback Tua Tagovailoa is in the NFL’s concussion protocol after playing the entire game against the Packers, according to Dolphins head coach Mike McDaniel.

The Dolphins lost to the Green Bay Packers after a Tua threw three interceptions. It is the second time this season the 24-year-old quarterback has landed in the concussion protocol.

It also comes several months after he suffered an apparent head injury and the league and the players’ union agreed to update the protocol – the NFL’s policies for assessing and caring for players who sustain a concussion.

McDaniel said Monday afternoon that he had only found out “a couple hours ago” that Tagovailoa displayed concussion symptoms and had been placed in the league’s protocol by medical staff. He could not pinpoint a moment in Sunday’s game where Tagovailoa might have been injured.

It is unclear if Tagovailoa will be available to play this week against the New England Patriots, the coach said.