Sir Alex Ferguson has admitted his confusion at Manchester United’s defensive issues after his side had to come from behind to beat Braga 3-2 in the Champions League on Tuesday.
The Portuguese club were ahead after only 80 seconds, and made it two after 20 minutes as United threatened to implode with a makeshift defence which included Michael Carrick at centre-back.
Despite the Old Trafford side coming back strongly to win the game and make it nine points from three games in Group H, Sir Alex says he is unsure of how to rectify the current defensive concerns.
"We came through OK. I can't understand our defending. We made it difficult for ourselves [but we] got a result most people wouldn't have expected when we were two-nil down. Credit to the players, they don't stop," he told reporters.
The 70-year-old Scot is frustrated by the types of goals his side are conceding, with all manner of strikes making it difficult to pinpoint a specific weakness which could be improved in training.
"I can't get to the bottom of it. If you analyse all the goals we are losing, they are all different types, a cross and then a cutback and players free in the box tonight,” Sir Alex continued.
"It is difficult to put my finger on it. We are certainly not getting good starts to games, that's for sure."
With a defence of Rafael, Michael Carrick, Jonny Evans and Alexander Buttner, it was always going to be a testing night for United, with Rio Ferdinand being rested before Sunday's match with Premier League leaders Chelsea.
And despite the oddity of United's defensive troubles coming at Old Trafford, where their form is usually strong, Sir Alex was confident his side could arrest the alarming slip in solidity.
He added: "It's the home games we are losing the goals so early. Away from home it is not a problem in terms of early goals. We will sort it, I am sure of that."