Manchester United have announced the signing of the midfielder Henrikh Mkhitaryan for an undisclosed fee believed to be £30m.

Mkhitaryan has signed a four-year contract after joining from Borussia Dortmund, with the option for a further year.

“Manchester United is delighted to announce that Henrikh Mkhitaryan has completed his transfer from Borussia Dortmund. Henrikh joins on a four-year contract with the option to extend for a further year,” a statement on the club’s website confirmed on Wednesday.

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Mkhitaryan, 27, made 140 appearances and scored 41 goals for Borussia Dortmund after joining them from Shakhtar Donetsk in 2013. The midfielder is Armenia’s all-time top scorer, with 19 goals in 59 appearances since his international debut in January 2007, and he has collected the Armenian footballer of the year award on five occasions.

Mkhitaryan becomes United’s third signing of the summer after deals for the Ivory Coast defender Eric Bailly and the former Sweden captain Zlatan Ibrahimovic.