Mourinho has had a testing start to the season, although his side are sixth in the Premier League table.
Despite his side's wavering form on the pitch, Watford boss Walter Mazzarri still thinks United shouldn't be written off just yet.
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Jose Mourinho has had a tough start to the season
When asked who he thinks could win the title, Mazzarri said: "The list of candidates is long.
"Manchester City, Manchester United, Chelsea, Tottenham, Liverpool and Arsenal.
"Not in all of Europe is there a championship as unpredictable as the English one.
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Walter Mazzarri thinks Manchester United can win the title
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Walter Mazzarri thinks Pep Guardiola can deliver the title for Manchester City
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“At United, if a year ago a coach like Van Gaal had problems, it means you need a proper job done and with time, Mourinho will sort everything. City have had some small setbacks but nothing remarkable.
"Mourinho and Guardiola have shown on the pitch during their careers what they are capable of doing. And we have had just 11 maches, it is early to come to conclusions.
"The example of Juventus in Serie A last year maybe enough: there were in mid-table and won the league title.”