Gilberto has called on his Arsenal team-mates to draw inspiration from their win at Old Trafford, a game in which Thierry Henry missed, ahead of Sunday's clash with Chelsea.
With Arsenal continuing to flatter to deceive domestically this season, a weekend trip to Stamford Bridge after a busy midweek of European action is not something Arsene Wenger would have wished for.
The furore over Henry's neck problem, that threatens to keep him out until the new year, continues to occupy column inches but Gilberto believes Arsenal's other players have to prove their own abilities in the absence of their captain - starting against Chelsea.
"We are doing our best without Thierry," said Arsenal's stand-in captain.
"Thierry is very important to us because he's the skipper. But we are doing best and have shown that we can play without him.
"Against Chelsea he might not play so we need to do our best without him and I hope we do the job well.
"Now we have another tough match against Chelsea. It won't be easy to win the game as it's always difficult to win at Stamford Bridge."
While Gilberto admits a trip across the capital from north to west to face the champions is never an easy proposition, Arsenal could be boosted if Johan Djourou is passed fit to figure.
With William Gallas looking increasingly unlikely to play any part against his former club and Kolo Toure suspended, the need for Djourou to feature is absolute.
"William Gallas is a big question mark, Johan Djourou is a small question mark," Wenger told Arsenal TV Online.
"All that will be assessed tomorrow morning or Saturday morning at the latest.
"I'm reasonably optimistic for Djourou and a little bit less for Gallas. William had a scan today.
"That will tell us whether we can go further with him or he has to slow his recovery down."