The English champions were rocked by four second half goals, with 16-year-old Tyler Adams among the goalscorers for the New York Red Bulls team.
“I was surprised by our fragilities”, said Mourinho.
“We’ve talked a lot about what the future of this club will be, and that it’ll involve investment in the youth, the investment in the academy, ” Red Bulls coach Jesse Marsch said. “We play this team 10 times, we win nine, but the second half was a disaster”.
“We hit the post two or three times, I don’t know, but they’re young guys, they have quality, and motivation, their motivation is really high to play against us”.
It should have been 2-0 four minutes later as Victor Moses scooped the ball over Red Bulls goalkeeper Kyle Reynish, but the winger’s shot came back off the upright.
Mourinho made eight changes after the break with Hazard, Terry, Costa all introduced while Asmir Begovic was handed his first Chelsea start following his summer switch from Stoke.
In contrast, Chelsea had plenty of experienced players on show and led 1-0 at half-time courtesy of a well-taken goal from Loic Remy on 27 minutes.
Begovic in the second half was not sharp in his reactions but it’s a outcome of being exhausted from training. But Terry’s miscue enabled New York to draw even.
After seeing his shot cleared off the line just second earlier, substitute Castellanos pounced on a poor back pass from Terry to round new Chelsea goalkeeper Begovic. The visitors respond immediately through Hazard who rifles the ball into the back of the net from the edge of the penalty area from a well-worked free-kick.
But Davis corralled an errant clearance attempt by Ramires at the top of the Chelsea area shortly thereafter and scored again.
However, Chelsea were not to be denied seven minutes later thanks to Remy, who adjusted his body, took an extra touch and fired the ball into the net, having been picked out by Oscar.
“I think I’ll keep my jersey, and it’ll be enough, ” Davis said. A day later, they fielded a team of kids, backups and minor leaguers and blitzed defending Premier League champion Chelsea 4-2. “Two goals is a good trade off”.
Oh dear, oh dear Chelsea – Make no mistake, this was a strong Chelsea side which suffered defeat in the most embarrassing of ways to a second-string New York Red Bulls side.
The Red Bulls looked surprisingly strong against Chelsea despite coming off Tuesday’s quarterfinal loss to the Philadelphia Union in the US Open Cup competition.