straight to your inboxManchester United and Premier League rivals Liverpool and Arsenal have reportedly been put on 'red alert' to sign Barcelona star Antoine Griezmann.United got their transfer window rolling earlier this week as they strengthened their midfield options with the acquisition of Ajax playmaker Donny van de Beek.Ole Gunnar Solskjaer still wants more attacking reinforcements to increase his side's chances of winning the Premier League, with Borussia Dortmund winger Jadon Sancho the