But Conte has made no secret of his desire to recruit more players to strengthen his first team for a season that sees the addition of Champions League matches to their fixture list.
Conte said he did not want to answer questions about Costa, but tellingly conceded: "For me it's in the past".
"Instead, we conceded three goals and the second half was very hard to change the final result, despite the great commitment, great desire and great will of my players".
Big-spending Manchester City won 2-0 at promoted Brighton and Hove Albion, while Huddersfield Town marked their top-flight return with a 3-0 win at Crystal Palace that sent them top of the table.
"We must pay attention and try to keep our heads the rest of the game".
New signing Alvaro Morata was introduced with an hour on the clock as he replaced Michy Batshuayi in a tactical substitution. Chelsea's hierarchy are well aware of the current squad situation and the expectation is that three or four more players will arrive before the close of the transfer window.
The likeliest solution now is David Luiz holding the midfield fort alongside N'Golo Kante, leaving an unfamiliar back three of Cesar Azpilicueta, Andreas Christensen and Antonio Rudiger to deal with Harry Kane and Dele Alli.
Britos was standing nearly on the line before nudging in the loose ball after Simon Mignolet pushed it onto the bar.
"The equaliser was offside". A quick free-kick led to Defour swinging in a cross from the right and an unmarked Vokes planted a header past Courtois, with loud boos greeting the champion when the half-time whistle was blown.
"The club are trying to do their best", said the Italian.
Egyptian defender Ahmed Hegazi, on loan to West Bromwich Albion from Al Ahly, scored on his debut in the 1-0 win at home to Bournemouth.
Late goals from substitutes Aaron Ramsey and Olivier Giroud earned Arsenal a 4-3 win over Leicester in Friday's frantic opening game.
After Busy Preseason, Jose Mourinho Seems to Finally Know His Best Team
Manchester United start their Premier League campaign against West Ham at Old Trafford on Sunday, with kick-off at 16:00 BST. We got a central midfielder, a striker, obviously the 25 per cent would be for a player from the sides, but we have players.
Mets trade Neil Walker to Brewers, per report
Prior to going to the Mets in 2016 via trade, he spent his first seven Major League Baseball seasons with the Pittsburgh Pirates. Walker is an impending free agent and is owed the remainder of his $17.2 million salary this season.
Burnley 3-2 Chelsea: Reigning Premier League champs shocked in opening game
Speaking in an exclusive interview with ESPN FC, the BT Sport pundit said: "The mentality has got to improve". I have to try to adapt a new system and to anticipate playing with nine or 10 men in the next game.