
Arsenal must "improve massively" if they are to continue winning games, says manager Mikel Arteta after the Gunners were held by Sporting Lisbon in an entertaining Europa League last-16 first leg.
France defender William Saliba put the Premier League leaders ahead with a towering header before Sporting took advantage of poor defending to score through Goncalo Inacio and Paulinho.
An own goal by the hosts' Japanese midfielder Hidemasa Morita ensured Arsenal will start on level terms when the teams meet in the return leg at Emirates Stadium next Thursday (20:00 GMT).
However, Arteta was unimpressed his side had conceded two goals for the second successive game.
"It's true that it's something that we must improve massively if we want to keep winning games," said the Spaniard.
"When you concede two poor goals like we did away from home in Europe it's very difficult to get a positive result.
"We gave too many simple balls away. We need to defend our box much better."
In an absorbing game in the Portuguese capital, Arsenal's first-half lead lasted just 12 minutes before Inacio nodded home the equaliser after hesitancy from keeper Matt Turner.
Paulinho fired Sporting ahead from close range only for Arsenal to equalise through a wicked deflection off Morita.
Both teams created numerous chances in a free-flowing encounter.
Sporting's former Tottenham winger Marcus Edwards was denied by Turner when the score was 1-1, while Paulinho wasted a great opportunity to make it 3-1.
Arsenal had a chance to take a lead back to London but Fabio Vieira's header was kept out by Antonio Adan.
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Arteta faces balancing act in Arsenal's trophy hunt
Arsenal are chasing a first Premier League title since 2003-04 but Arteta clearly sees the Europa League as something worth winning rather than a distraction to the main prize.
Despite making six changes, he fielded several key players in Portugal including Gabriel Martinelli - Arsenal's leading scorer in the Premier League - and Bukayo Saka before Sunday's London derby at Fulham (14:00).
It is all to play for in seven days' time in the return leg against Sporting, but Arteta's side will have to improve defensively if they are to advance to the quarter-finals against opponents who started the season in the Champions League.
Poland defender Jakub Kiwior made his first Arsenal appearance since arriving in January from Serie A side Spezia for £17.6m while Turner produced a mixed performance after replacing first-choice keeper Aaron Ramsdale.
The Gunners were sloppy at times and the two goals they conceded were poor by their recent standards but, just as they did against Bournemouth at the weekend, they showed character after falling behind and continue to look a threat going forward.
Martinelli was denied after trying to clip the ball over the keeper at the start of the second half before the Brazil forward looked certain to score after a superb solo run only to be denied by a well-timed challenge by Jeremiah St Juste.
The games are starting to come thick and fast for the Gunners and Arteta faces a fine balancing act as his side chase domestic and European honours.
"In this competition if you want to go through you have to go through difficult moments," the Arsenal boss said. "We're still alive and hopefully we'll play better at the Emirates."


Player of the match
XhakaGranit Xhaka
Sporting Lisbon
Avg
- Squad number79Player nameYoussef ChermitiAverage rating
5.77
- Squad number18Player nameFatawuAverage rating
5.72
- Squad number26Player nameDiomandeAverage rating
5.71
- Squad number10Player nameEdwardsAverage rating
5.68
- Squad number25Player nameGonçalo InácioAverage rating
5.63
- Squad number3Player nameSt. JusteAverage rating
5.61
- Squad number11Player nameNuno SantosAverage rating
5.47
- Squad number1Player nameAdánAverage rating
5.46
- Squad number4Player nameCoatesAverage rating
5.44
- Squad number5Player nameMoritaAverage rating
5.42
- Squad number2Player nameMatheus ReisAverage rating
5.40
- Squad number20Player namePaulinhoAverage rating
5.37
- Squad number47Player nameRicardo EsgaioAverage rating
5.34
- Squad number28Player namePoteAverage rating
5.27
- Squad number17Player nameTrincãoAverage rating
5.26
Arsenal
Avg
Squad number34Player nameXhaka
Average rating7.17
Squad number11Player nameGabriel Martinelli
Average rating7.10
Squad number7Player nameSaka
Average rating7.08
Squad number12Player nameSaliba
Average rating7.07
Squad number4Player nameWhite
Average rating6.97
Squad number24Player nameNelson
Average rating6.63
Squad number21Player nameFábio Vieira
Average rating6.63
Squad number35Player nameZinchenko
Average rating6.57
Squad number20Player nameJorginho
Average rating6.46
Squad number18Player nameTomiyasu
Average rating6.31
Squad number6Player nameGabriel Magalhães
Average rating6.28
Squad number5Player namePartey
Average rating6.24
Squad number15Player nameKiwior
Average rating6.13
Squad number30Player nameTurner
Average rating6.06
Squad number10Player nameSmith Rowe
Average rating6.05
Line-ups
Sporting
Formation 3-4-2-1
- 1Adán
- 3St. Juste
- 4CoatesBooked at 23mins
- 25Inácio
- 47de Sousa EsgaioSubstituted forDiomandeat 76'minutes
- 5MoritaBooked at 58mins
- 28Pereira Gonçalves
- 2Reis de Lima
- 10EdwardsSubstituted forFatawuat 89'minutes
- 17Machado TrincãoSubstituted forGomes dos Santosat 71'minutes
- 20Dias FernandesSubstituted forRamalho Chermitiat 76'minutes
Substitutes
- 11Gomes dos Santos
- 12Israel
- 13Novo Neto
- 16Costa Rocha
- 18Fatawu
- 26Diomande
- 32Tanlongo
- 33Gomes Lourenço
- 77Borges Cabral
- 79Ramalho Chermiti
- 82Espanha Fernandes
- 84Essugo
Arsenal
Formation 4-3-3
- 30Turner
- 4White
- 12Saliba
- 15KiwiorSubstituted forGabrielat 71'minutes
- 35ZinchenkoBooked at 23minsSubstituted forTomiyasuat 63'minutes
- 21Fábio Vieira
- 20JorginhoSubstituted forParteyat 71'minutes
- 34Xhaka
- 7Saka
- 11MartinelliBooked at 43mins
- 24NelsonSubstituted forSmith Roweat 71'minutes
Substitutes
- 1Ramsdale
- 5Partey
- 6Gabriel
- 10Smith Rowe
- 16Holding
- 18Tomiyasu
- 41Bandeira
- 56Hillson
- 71Sagoe Junior
- 72Smith
- 97Walters
- Referee:
- Tobias Stieler
- Attendance:
- 36,006