Bernie Ecclestone has finally named the two teams he suspects will struggle to make it to March's 2010 season opener.

Several times in recent interviews, the F1 chief executive has indicated that one or two of the sport's new teams may fold prior to the beginning of the world championship in Bahrain.

On a visit to the world cup ski races at Kitzbuhel in Austria, he told Salzburger Nachrichten: "Campos and the American team (USF1) have problems -- financial, not technical.

"But I hope they will be ok," the 79-year-old added.

Ecclestone said recently that F1 will be in good shape for this season so long as 10 strong teams are on the grid.

"I think formula one is looking much stronger than it has for a long time," he insisted. "It's a shame to lose some manufacturers, but let's be honest: we all knew that their time in F1 was limited."

Timo Glock, to this year drive for Virgin, believes the rumours about struggling new teams will soon be muted.

"I'm not worried. We are fully on schedule and have our budget," he told Germany's Auto Motor und Sport.

"The rumours may be because there is not much happening in formula one at the moment, but I think that will change quickly from now on," Glock added.