Josh Naylor is headed to the American League. 

The Diamondbacks’ first baseman is going to the Mariners in a trade on Thursday night, The Post’s Jon Heyman confirmed 

Minor league pitchers Ashton Izzi and Brandyn Garcia are headed back to Arizona.

The move is the first domino to fall and could be a sign of several more to come for Arizona, as the Diamondbacks appear to be sellers heading into next week.

This story will be updated