Jay Gruden has said that Andy Dalton must work on all aspects of his game in preparation for the 2013 NFL season.

The Cincinnati Bengals quarterback has led the side to the playoffs twice during his two seasons in the NFL, but the team has been knocked out in the first round on both occasions.

The offensive coordinator told WLW-AM: "There's not one part of his game that he doesn't need to improve. Hopefully some of our guys are working out with him and they're throwing.

"But really, within the off-season, your arm strength, your strength, your footwork, basically your fundamentals of football. And obviously he needs to get better with his deep ball accuracy and touch, and there's not really one part of his game that he can't really improve upon.

"He has to get better in every phase, scramble ability, foot quickness, accuracy, deep accuracy, short, anticipation. He's got a long way to go. He's done some great things for a second-year quarterback, won a lot of games and thrown some good touchdown passes, but we feel like he has not come close to his potential."

The 25-year-old completed 27 touchdown passes during the 2012 regular season.