The wide receiver joined the New England Patriots during the off-season, having reached the end of his contract with the St Louis Rams.
Speaking at a press conference, the Patriots quarterback said: "Well he is incredibly hard working. He loves football, and he wants to do the right thing.
"He's had a lot of production in the league when he has been on the field and been healthy. Hopefully he can continue to do the things he has since he got here.
"I don't want to put any expectations on him. That's really for him to earn, but he is a big part of our offense and hopefully he has a very productive year."
The Patriots face the Buffalo Bills on Sunday.