Manager Sir Alex Ferguson has no idea what is causing his Manchester United side its defensive headaches.
For the eighth time in 12 games this season, United found itself behind.
Thanks to two goals from
However, with Chelsea to come twice, and a Premier League home game against Arsenal before the rematch with Braga in a fortnight, Ferguson knows unless he finds a solution, his team could be in massive trouble.
"I can't get to the bottom of it I am afraid," he said.
"If you analyse the goals we are losing, they have come from throw-ins, crosses, cut-backs, all sorts, and they are finding players free in the box.
"It is difficult to put your finger on it, and it is a concern because it is making it difficult for us."
This time United paid for resting
The England man was at fault for Braga's second when he was turned far too easily by Eder, who provided Alan with the easiest of finishes.
At that stage, United was already trailing as Alan had opened his account after just two minutes.
But Hernandez prompted a fightback and after pulling a goal back from close range, he also bagged the winner 15 minutes from time after he got on the end of
"The boy is improving all the time," Ferguson said of Hernandez.
"His goal ratio is fantastic and the way he bent his run for the second goal was terrific.
"He is a fantastic trainer and he has given me a problem, which is good."
It was the first time United had recovered from two goals down in a European game since it beat Juventus in the 1999 semi-final, although Ferguson could do without the omen.
"I would rather be without it," he said.
The victory did not come without its pain either as