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Marco Silva has emerged as Watford's leading managerial target but they face competition for his services, sources close to the club have told ESPN FC.
The future of Hull City boss Silva is uncertain following their relegation from the Premier League, and the sources said he is highly regarded at Watford.
The Hornets confirmed this week that Walter Mazzarri will be leaving after the final Premier League game of the season at home to Manchester City on Sunday.