Walter Mazzarri insists he always believed his team could win after Watford produced a stunning comeback from 2-0 down to sink West Ham United at the London Stadium.

The Hornets appeared to be heading for defeat after conceding twice in the first half but a sensational response from the visitors stunned Slaven Bilic's side.

Speaking after his first win in charge, head coach Mazzarri said: “I’m very, very happy especially to have a win in a game we were losing 2-0 against such a big team in such a big stadium.

"For sure it gives us a lot of confidence to the players and the whole team. I’m a new manager here at Watford but slowly we are going to build great things."

Mazzarri saw encouraging signs in the second half against Arsenal in their last match and his players bought into his mentality as the Hornets overturned a two-goal deficit to win 4-2 against the Irons in front of a jubilant away following.

The Italian said: “As a coach for me I have the mentality that as you could see against Arsenal, when we were losing 3-0 in the first half, we came with a completely different mentality in the second half.

"I always tell my players don’t think so much what has happened but think what you can do and my players know this. I’m very happy they have this confidence and my mentality."

Mazzarri added: “Another concept I always tell my players is that they have to believe that we can win until the referee whistles for the end of the game. This is a concept that I have always done and taught the players I have coached and I’m doing it now."