And according to the Daily Mail Herrera has attracted interest from both Atletico Madrid and Juventus.
Atletico have stepped up their pursuit of the 26-year-old in recent weeks, while Juve are targeting the former Real Zaragoza star as a possible replacement for Paul Pogba.
United could be forced to sell the midfielder, who has scored four goals in 21 Premier League appearances this term, if they fail to qualify for the Champions League.
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