The Patriots haven't exactly been a well-oiled machine offensively in the preseason and Rob Gronkowski has expressed his displeasure with their results.

Known for their explosive plays in recent seasons, the Patriots have struggled to move the ball quickly.

Gronkowski has four receptions for a total of 44 yards in two preseason games.

"We're not playing well as a unit, and when we're not playing well as a unit, you're never really happy," the tight end said.

"It's definitely frustrating. We gotta take what we did wrong, we gotta take what we did right, and build off it," Gronkowski added. "We have to do our corrections. We have to go out and get our chemistry down as an offense in practice. That's where it starts."