Twitter user @howaythalad posted a photo taken from Newcastle United's home dressing room.
The photograph shows a door next to Allan Saint-Maximin’s place leading to a large, newly-plastered room.
He tweeted: “The lads are getting a treat for their next home game. New fitness studio next to the changing rooms.”
Co-owner Amanda Staveley pledged upgrades to St James’s Park after last month’s takeover. Newcastle have been contacted for comment.