James Roberts reveals London Olympic Games pain Australia's 4x100m team (L to R) Eamon Sullivan, James Magnussen Matt Targett and James Roberts ahead of the mens 4x100 freestyle final at the Aquatics Centre during the London Olympic Games in London on July 29, 2012. Picture: AAP Source: AAP IT was one of the biggest shocks of Australia's London Olympic campaign. But the men's 4x100m freestyle relay team's gutwrenching fourth placing was put in perspective on Wednesday after James Roberts became the second member to reveal he had been battling for fitness in London. Eamon Sullivan revealed he had secretly carried a biceps injury into the Games after the world champions - dubbed the "Weapons of Mass Destruction" - crashed and burned at London. Now Roberts has admitted that he had been hospitalised due to a severe stomach bug a month before the Olympics and was still battling the effects in London. Roberts had arrived at London with the world's second fastest 100m time for 2012 - behind only relay teammate and world champion James Magnussen - but appeared a shell of himself in the final. I had other things going on before the Olympics. I was hospitalised a month before leaving for London and lost 4kg," Roberts said at the national titles in Adelaide. Going into the Olympics I was just trying to get my weight back and I think I lost a lot of my strength. Rather than feel regret over the London flop, Roberts said the relay team only had redemption on their minds ahead of July's world titles in Barcelona. Five of the six members of the disappointing London relay team look to have booked 4x100m spots for Spain after Sullivan missed the national titles in Adelaide recovering surgery. It's not just London disappointment the relay team want to put behind them after all six members copped fines and suspended bans for the pre-Games Stilnox scandal. "Obviously we have been through a lot as a team," Roberts said. But coming into this we didn't lack motivation. We want nothing more than to prove not only to ourselves but everyone else that we are right up there with the best. It was always going to be a tough few months but I think we have come out of it well. Relay team member Cameron McEvoy, 18, has been one of the most impressive in Adelaide, setting a personal best 48.07 in the national 100m freestyle final to claim silver behind Magnussen on Tuesday night. Another relay member Matt Targett (21.92) was fastest ahead of Thursday night's 50m freestyle decider ahead of fellow finalists Magnussen (4th; 22.06), McEvoy (5th; 22.38) and Roberts (7th; 22.52).