It looks like the New England Patriots' big offseason addition at receiver may be going through some growing pains adjusting to his new offense. Stefon Diggs, the Patriots' free agent acquisition from this summer,

The Stefon Diggs experience reportedly isn’t going well in New England. Shortly after a tense exchange Thursday with Patriots head coach Mike Vrabel over the star receiver’s Week 1 availability, NBC Sports Boston’s Phil Perry shed a bit more light on a new marriage that’s already on shaky ground.

Wide receiver Stefon Diggs is not in uniform as the Patriots warm up to play the Vikings on Saturday afternoon in a preseason matchup. Diggs is in sweats 30 minutes ahead of kickoff, per WBZ’s Dan Roche. Diggs began his NFL career with the Vikings.