Manchester City boss Pep Guardiola believes Erling Haaland has already silenced the doubters after his debut double sank West Ham 2-0. 

Haaland had faced some criticism for his underwhelming performance in the Community Shield defeat by Liverpool last weekend. But the 51 million pound striker announced his arrival in the Premier League in style with a goal in each half, a penalty followed by a neat finish, to open his City account, reports DPA.