Republic of Ireland's Darren Randolph and John O'Shea
Having produced an impressive performance during the 1-1 draw with Sweden in their Group E opener, the Irish were unable to cope with an incisive Belgium frontline, who sealed a 3-0 win during a rampant counter-attacking display.
Axel Witsel scores Belgium's second goal
Having been contained by a well-drilled Irish defence for the first 45 minutes in Bordeaux, the Red Devils took the lead through Romelu Lukaku on 48 minutes, before Axel Witsel added a second 13 minutes later.
Lukaku, who had been singled out for criticism by many fans and pundits after Belgium's defeat to Italy, rounded off the win with his second and Belgium's third after 70 minutes.
Republic of Ireland's John O'Shea in action with Belgium's Jan Vertonghen
Commenting on the defeat, O'Shea admitted to RTE Sport that Ireland had left themselves too open.
He said: "In patches, the first half was okay, but not good enough in terms of how we played against Sweden, how good we were on the ball and that clinical edge in terms of keeping our shape and keeping our compactness, especially when we were attacking, that's something we're going to have to improve on.
"It's not just a case of keeping 10 men behind the ball, we did that at times, but when you're attacking, it's that cliché that you're sometimes at your most vulnerable."
O'Shea insists Ireland can claim a win over the Italians, who are already through to the knockout stages
The result leaves Martin O'Neill's men bottom of Group E and in need of a win over Italy on June 22nd, with the Azzurri already assured of a place in the knockout stages as group winners.
But despite being hugely impressed by Antonio Conte's side, O'Shea is confident his team can get a result and progress.
He added: "We know it'll be difficult, Italy have been fantastic in their first two games.
"But we have to take the positives from the first half tonight and the game against Sweden, and if we do that, with a bit more discipline and control, I think we can get something from Italy."