Mark Schwarzer admits his goalkeeping howler against Roma made him 'look very silly' New Chelsea stopper Mark Schwarzer's hopes of pressuring number one goal keeper Petr Cech have suffered a blow after conceding this embarrassing goal against Roma. Mark Schwarzer is philosophical about his howler of a mistake against Roma, conceding an embarassing goal off a back-pass. IT was a rare mistake in a great career, but Mark Schwarzer admits he looked silly gifting a goal from a pass-back in Chelsea's pre-season friendly against Roma. The blunder, in the opening quarter of Sunday's clash in Washington DC, has attracted well over 500,000 views on YouTube and its fair share of television airtime. While the veteran Socceroos goalkeeper is keen to put it past him, he knows it will be on his mind next time he gloves up for his new Premier League club. "I was saying to my wife when I got home, I don't remember the last time I actually made a mistake like that," Schwarzer told AAP on Thursday. It was just one of the those things. With Schwarzer advancing, a defender made an intercept back pass which bobbled as the goalkeeper went to stop it. The ball bounced off his foot toward the right post and, as he chased, it cannoned back and Roma attacker Erik Lamela got an easy tap in as Schwarzer made a second desperate lunge. "You look very silly, obviously," said Schwarzer. It was my mistake. It was very disappointing, but it does happen sometimes. You do make mistakes. While those opposite took plenty of joy from his misfortune, Schwarzer said his teammates and manager Jose Mourinho were more encouraging. They were all fine. They all understand. They were all very supportive and encouraging," he said. The manager was very good about it and encouraged me to forget about it and get on with it - which I did. I don't think (it will affect me going forward). It's obviously there in the back of your mind, because you're always think the last time you played that you made a mistake. But you want to try and put things right. I think whenever you make a mistake it always gives you a bit of a kick in the teeth and reiterates that you can't take anything for granted. I'm old enough and experienced enough to know these things happen. Schwarzer has been at the Blues for barely a month, having left Fulham after five years at the end of last season, and is expected to begin as back up to longtime Chelsea keeper Petr Cech. He debuted for Chelsea in the second of seven pre-season tour matches, beating a Malaysia XI side 4-1 last month. The 40-year-old said the move to Stamford Bridge had been a big change, but he was well prepared for the Premier League season ahead, with Chelsea facing newcomers Hull City in their opening match on Sunday. Obviously the last game was a blip for me. (But) overall, I feel I performed pretty well throughout the whole of the pre-season. I'm confident and feel very fit and well going into the start of the season.