Duffen saw his club make a superb start to the season but their form has faded and Newcastle's victory over Middlesbrough saw the East Yorkshire side slip into the relegation zone.

They are adrift of Newcastle on goal difference with two games remaining, and must face Manchester United on the final weekend of the season.

United may still be chasing the title at that stage, making this weekend's Reebok Stadium clash one Hull are desperate to take three points from.

"Certainly a win on Saturday is imperative," Duffen told Sky Sports News.

"Bolton have proved they're a really robust side this season.

"If we (beat Bolton) then of course we'll have an eye on results elsewhere.

"There are clubs that may not yet be in the mix who could come into the mix over these last two games."