Nwaneri’s first-half goal was his second in the league this season.
He became the sixth player to score multiple Premier League goals before turning 18, after Wayne Rooney (seven), Michael Owen (five), Danny Cadamarteri (three), James Milner (three) and Federico Macheda (two). ).
He was booked just before half-time for taking too long on a corner and replaced at half-time by Gabriel Martinelli due to injury.
“Really bad news because I think we’ve lost him,” Arteta said afterwards.
“We had to take him off at half-time because of some muscle problems.”
The England under-19 international has replaced the injured Bukayo Saka on the right wing.
“What a good replacement Nwaneri is for Bukayo Saka. He ticks the boxes – the pace, the body shape and the beautiful left foot he has,” Upson said on BBC Radio 5 Live after the teenager put Arsenal ahead.
Arsenal’s failure to collect maximum points means Liverpool have the chance to be eight points clear at the top on Sunday if they beat Manchester United.
“It’s not the time to think too much about the title,” said Arsenal defender Riccardo Calafiori. “We need to focus on ourselves.”
Redknapp added: “If Liverpool win tomorrow, this will open the floodgates for them. I’ve said there will be twists and turns, but if Arsenal continue to act like this there won’t be twists and turns.”
“Arsenal have the same points as last season at this point, but they are still not playing well. They don’t have Saka and they are finding it difficult to open a team at the moment. The game is difficult for them at the moment.”
Arteta said: “In the second half we didn’t really take the game or dominate enough to have certain moments and be more of a threat in their half.
“When you play every three days, or less, you cannot, with the number of injuries and situations, maintain the level of performance and competitiveness. Today we were lacking in the second half.
“Today wasn’t about fatigue. It was about the simple things we have to do in possession to create opportunities and dominate the game in the right areas.”