Lampard denies favouritism will be shown to his big money arrivals with questions about Toni Rudiger's future.
"Every player can play their way into the starting XI, that's in every player's hands," said Lampard. "That's how I work here. The things I do are always in the best interests of the team and what's best for the club because we're trying to get results every week.
"The players all know that and the beauty of the window being shut is that we can get to work and know what the squad is. Everybody knows that they can contribute and we'll need them and rely on them because of the amount of games we play. Toni's the same as every other player on that one."
This week, Lampard was pleased to see his players getting additional game time with their countries to help with match fitness and hopes those who performed well will return to club duty full of confidence.
"I think Reece [James] had a fantastic debut, Mason [Mount] gets his goal and contributed in those two games that he played. Where players have not really had pre-season games or had enough minutes on the pitch, I'm actually happy. Sometimes you might bemoan the fact that a player might go away and play three 90 minutes or big minutes in games when they're away because you're kind of selfish and want them for Chelsea. At the moment our players need games so I'm pleased for the ones who have played."