Allen isn't the first veteran to find the transition to New England's offense tough. Chad Johnson famously struggled to pick up the route combinations on the fly.
"It is hard but also stimulating and very exciting," Allen said of learning the offense. "It is one of those things that where you pray for something so long, and when it comes, you can't cry because it's harder than you thought it was going to be.
"You have to accept that and be grateful for it."
The Patriots love their multifaceted two-tight end sets, which means there should be plenty of opportunity for Allen to play a large role alongside Gronkowski this season. Assuming he continues to grow in the offense, Allen is also great insurance if Gronk suffers another injury.