The Blues have lost to Arsenal, Manchester United and Liverpool this season, with their second defeat to the latter coming in the League Cup on Tuesday.
Villas-Boas has been criticised recently for Chelsea's slump in form and the team’s next few games could prove vital in their chances of winning a trophy come the end of this season.
Chelsea travel to Newcastle on Saturday to face Alan Pardew’s side, who have lost only one of their last eight games, before facing Valencia in a crucial Champions League tie at Stamford Bridge.
The Portuguese manager told reporters: “Our form against the top teams has not been good enough. Valencia [is]: life and death for both clubs.
“I don’t think confidence is at crisis point, we just have to pull ourselves together. We can only work hard and believe we can revert the situation.
“It’s only a crisis at the end of a season when you look at how many trophies you have won.”
Villas-Boas had nothing but praise for his managerial counterpart Pardew following the Magpies' impressive start to the season, with the Tyneside outfit sat fourth in the table.
"Pardew has brought serenity to Newcastle. In the past couple of years they’ve been in turmoil with managers and relegation and [being] sold to another owner," he said.
“But now there is empathy with the city and the club. They play good football - the way teams want to play.
"It’s an excellent challenge for us. We have done some good focused performances away from home - there are less relaxations, sometimes extra tension makes you more concentrated. [We have] shown more quality, [more] focus [and] attention away from home.
“This [match] is away against a team which is surprising everybody and which I think will continue to surprise.
“We’re not inhibited at Stamford Bridge but we might perform better away because the players [are] more concentrated. There is not a problem with Stamford Bridge, but a problem with the results.”