Wayne Rooney admits Manchester United's defending must improve after they let a two-goal lead slip to fall to a shock 5-3 defeat against Leicester on Sunday.
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The Red Devils twice led by two goals at the King Power Stadium, though a second-half collapse -- which saw Louis van Gaal's side concede four times in 21 minutes -- ensured their second Premier League defeat of the season.
Penalties conceded by Rafael and then Tyler Blackett -- with the latter red-carded for his mistake -- were duly converted by the Foxes, and United captain Rooney insists his side must learn from their errors.
"It's really disappointing," he told Sky Sports. "Going 3-1 up especially and then losing the game, it's hard to take.
"We should have done better as a team, seen the game out and won it from the position we were in. [There were] some mistakes and we didn't do well enough as a team to stop their goals.
"It's a game where we played some great stuff, scored some great goals and conceded some sloppy goals.
"We have to do better; we know that -- as a team we have to do better. It's not nice when you concede goals when you know we can prevent them. Everyone individually as a player knows that.
"They had the momentum with them in the last twenty minutes and we had to somehow try and find our composure and see the game out, but we failed to do that."
Rooney was booked for his protestations after Leicester's second penalty, and also believes referee Mark Clattenburg's decision to award Jamie Vardy the hosts' first spot-kick moments after the Foxes striker barged over Rafael was incorrect.
"I don't think it was a penalty," he added. "I think it is very harsh but referees nowadays have got a very difficult job to do -- we understand that.
"Mark [Clattenburg] had to make a decision on the spot of what he felt was right and we have to respect that."