Miami Dolphins quarterback Ryan Tannehill has admitted that he has been impressed with wide receiver Mario Williams this season.

The Buffalo Bills player, Tannehill said, will need to be watched closely on Sunday if the Dolphins are to get anything from the match.

"I think he's doing a really good job, he's being a threat, he's moving around, they have him moving around on all different positions on the defensive front," he told the Dolphins' official website.

"You can't just key in on one side of the line or one spot at defensive end for him. They'll put him right over the centre, bring him in an 'A' gap, do a lot of different things with him. He's definitely a force to be reckoned with and we're going to have to handle that."

Tannehill has thrown for 1,383 yards and six touchdowns in his five games so far this season.