Jos Buttler hopes to refocus England for a "massive" T20 World Cup encounter with Australia following their "poor" loss to Ireland at the Melbourne Cricket Ground on Wednesday.

A rain-affected encounter ultimately came to a close with a famous victory for Andrew Balbirnie's side, with a five-run triumph via the DLS method.

With a win and a loss to their name so far, England's hopes of progression through to the semi-finals from a competitive Group 1 have taken a hit, though New Zealand's washout against Afghanistan will come as a boost.

Regardless, Buttler was left frustrated by his side's performance, and acknowledges their next match at the MCG, with their Ashes rivals, will be a do-or-die test.

"We were poor," he told the BBC's Test Match Special. "We were a long way short of where we needed to be, and we let Ireland get away from us. We won the toss, but we didn't take advantage.

"Friday is massive. This result has put a lot of pressure on us now, but it is as big as it can get, to get us up for it at the MCG."

Balbirnie, whose 62 helped lay the groundwork for Ireland's victory, hailed the result as "pretty special", particularly to achieve it on Melbourne's hallowed ground.

"It's amazing, and it is emotional," he said. "We've never played a game of cricket here. 

"To come here and play the tournament favourites, with so many big names, and put on a show in front of friends and family and so many people around the world is very satisfying.

"To do this at one of the most amazing cricket grounds in the world is pretty special."