"If we scored then it would have changed the match but defensively we conceded more chances than what we were doing first half," Emery told Sky Sports.
"As usual in the last two months we started very badly in the second half and we need a solution. "I can try without going into the dressing room at half-time if that'll solve the problem. "It's not easy to understand. It is a big problem.
"It's hard to lose in the dying minutes of a game but I thought we weren't brave enough in the first half and we didn't defend well enough. "We tried to come out in the second half but we left spaces for Nigeria to exploit.
[The second half was] characterised by uncertainty again. It was a bit slapstick. We did everything to lose this match. It was in our hands. "At a certain point we stopped believing, I have no idea why. There were many individual mistakes.
Atletico Madrid manager, Diego Simeone has bemoaned his team's failure to play the way they planned in the first halfof their 1-0 defeat to Manchester City on Tuesday night.
Lampard told BBC Sport: "The red card changes the face of the game, the talk I do at half-time. It forced me into a reshuffle and it was always going to be difficult after that. "I think it could be given or not.
"The quality in the final third wasn't good enough to create a real clear cut chance, then they came into the game at the end of the first-half and it is an awful time to concede just before half-time, it is probably the worst.
Adekunle Gold, whose real name is Adekunle Kosoko, had tweeted about watching a particular TV show when Simi hilariously came for him, tweeting "This nig*a pressed phone through halfofit. Slept thru the other halfofit.
"It happens so quick that it's a tough one for the ref, you've got to kind of feel sorry for him. At the end of the day, these decisions don't really go your way when you come to these big stadiums and that's killed us.
In the second half, Leon Bailey pulled one back very early, before Calum Chambers' thumping header made it 2-2 with the final kick of the game. United's next game will be against Atletico Madrid on July 30.
"It was a bit of a strange second half without the rhythm from the team, and interruptions, but we hung in and did what was necessary to keep a clean sheet and we go from there."
"Tottenham have players who have known each other for years and in the first half they seemed quicker, but it's normal. "If we want to show our football we must defend further forward.
The Foxes stormed into a 5-0 lead at half-time and instead of taking their foot off the pedal in the second half, the visitors hit four more goals after the break.
It's not a surprise that the first halfof the game ended as a goalless draw after both sides failed to utilize their early Goalscoring chances in the first halfof the game.
Brighton added two goals in the second half to make it 4-0 before Tottenham scored in quick succession to make it 4-2. Brighton survived the late scare from Tottenham as they finished the game on top.