We had chances but couldn't score and that's the difference.
Unai Emery has been singing the praises of Monchi, one of the contenders to become Arsenal's new technical director.
Providing an update on Koscielny and Sokratis at a post-match news conference, Emery said: "I think they weren't big injuries for Sokratis [his ankle]".
"I am going to find the best first XI, because against Manchester United, we will need the best performance and quality".
Arsenal face an injury crisis after a suspected broken jaw for captain Laurent Koscielny and ankle problem for Sokratis in Friday's FA Cup fourth-round defeat by Manchester United left them with only one fit recognised central defender.
Arsenal drew 2-2 at United during the final stages of Jose Mourinho's reign but Emery said Solskjaer has transformed the club in the wake of the Portuguese coach's departure.
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Welbeck has picked up no less than seven injuries since his arrival from Old Trafford in 2014, which could end up totalling over two years on the treatment table during his five-year stint at the Emirates.
"For us, it's good because it's a very big test for us in this competition".
ESPN is reporting that Suarez now looks set to stay at the Spanish side until the end of the season after the north London club failed to reach an agreement with the La Liga giants.
"Maybe he has broken here", Emery added pointing to his jaw, "I hope not, but we have to wait". "We heard Martin Keown talking at the beginning of the show about partnerships and the fact that Laurent Koscielny coming back, that was something that could work on together".
The former Sevilla and PSG boss had fielded a much-changed team featuring a number of fringe players in the previous round against Blackpool, but is expected to go in with his full-strength team against Manchester United on Friday. The club is working.