La Liga News: 'Griezmann had to step it up' says Barcelona coach Valverde after beating Betis 5-2
"I am particularly delighted with Griezmann of course. It's important for him because he's just arrived. He gained confidence," added Valverde.
Griezmann copied Lionel Messi when curling in a left-footed shot shortly after half-time and then imitated NBA star LeBron James to celebrate it - his first goal came in the first half.
Carles Perez, Jordi Alba and Arturo Vidal scored Barcelona's remaining goals.