The Italian believes his side's continuing good form is proof that they are able to set aside off-the-field issues and concentrate on maintaining their trophy charge
Goals from Fernando Torres, Frank Lampard, Eden Hazard and Branislav Ivanovic gave the Blues their sixth win in seven games in all competitions to keep them four points clear at the head of the table.
Before the match there were questions over whether the release of the written judgment relating to John Terry's FA punishment for using racist language towards QPR defender Anton Ferdinand and the offensive tweet Ashley Cole directed at the governing body had affected the team's focus.
But Di Matteo believes the emphatic performance of his men has put any such concerns to rest.
"I think the results are telling us that we are able to blank things out, that we can focus on our aim and target, which is winning football matches," he told reporters. "It shows how professional the group is.
"We concentrate on our strength and try to win games with the players we have and the footballing philosophy we are aiming to play, and at the moment the team is in healthy form.
"We are creating lots of chances, scoring lots of goals and with different scorers - we don't just rely on one player. It's a team that is in good shape.
"I've always said that I have a good squad, and we're utilising it. You've not seen much of the likes of Azpilicueta or Romeu who will be given more time after the international break.
"We've also got Marko Marin coming back into the team, and Daniel Sturridge has been injured. I think we've got options, and it's important we have those, because so far we've been quite lucky with injuries."
Di Matteo also expressed his surprise that Juan Mata, who produced another stellar display and now has four goals and five assists in his last five matches, was omitted from Vicente Del Bosque's Spain squad for their forthcoming World Cup qualifiers.
"I'm surprised, and I'm very happy that he stays with me!" the Blues boss joked. "But I feel for him, because he's in great form.
"I don't know the reasons why, but we are happy he is going to be with us."