Chelsea boss Jose Mourinho was concerned by the defensive lapses his side showed during their 4-2 friendly defeat to New York Red Bulls.

The Premier League champions had led 1-0 in New Jersey at half-time thanks to a goal from Loic Remy, but the Blues shipped four second-half strikes to lose the match to their American opponents despite finding the back of the net again through Eden Hazard.

Their Portuguese boss admitted he was surprised by his side after the interval and conceded that their performance had not been good enough.

He said: “I said before we have no fragilities but today we had fragilities, lots of fragilities. I was surprised that we were not good enough in the second half to cope with that.”

The 52-year-old insisted that he was not too concerned by the defeat as he believed the match had been a good workout for his side ahead of the start of the new campaign.

He added: “Obviously we needed to play better than we did in the second half defensively, and there were also too many missed chances but the intention of pre-season matches is to play, to run, to bring intensity back, so no problem.”

The west London club begin the new campaign when they contest the Community Shield against Arsenal at Wembley on August 2 before they start the defence of their Premier League Crown six days later against Swansea City at Stamford Bridge.

The Blues are the 2.50 favourites to successfully defend their league title next season.