The former Inter goalkeeper and Real Madrid midfielder, respectively, were two additions to the squad, which was also bolstered by defender Ryan Nelsen from Spurs, Manchester United's Ji-Sung Park and Junior Hoilett, who joined from Blackburn.
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Even though QPR have so far managed to obtain just two points from four games, Villas-Boas believes that the team - who visit White Hart Lane on Sunday - will soon start winning matches.
"At the moment QPR's position in the table does not reflect the team that they can be or where they can finish in the league," Villas-Boas told Spurs TV Online.
"This is a team who have brought in tremendous players in the summer window.
"They brought in very important players from all over the world, players who are European champions, players who have had success at international level.
"They will virtually bring another level to the Premier League so it will be a very difficult game on Sunday and we have to be careful."
Tottenham's Premier League campaign under Villas-Boas has started to gain momentum with the club picking up their first win of the season last weekend against Reading.
However, their home form has seen them pick up only two points from the visits of Norwich and West Brom, with Spurs conceding a late goal in each game.
But after a dominant display in midweek against Lazio in the Europa League, Villas-Boas will be hoping his side can build on last week's 3-1 victory at the Madejski Stadium.