Manchester United have joined Liverpool and Bayern Munich in the chase for Borussia Dortmund star Christian Pulisic, according to reports in Germany. There looks set to be a tug-of-war between the three powerhouse clubs this summer for the 19-year-old American playmaker, who is valued at £40m. Pulisic is contracted to Dortmund until 2020 and the club will be desperate to keep hold of a player who regularly impresses in the Bundesliga.