The Gunners welcomed London rivals Palace to the Emirates on Thursday evening, looking to secure their fifth straight win in all competitions.
Mikel Arteta was without defenders Tierney and Mari but both are likely to return on Monday when Arsenal host Newcastle United.
The club confirmed prior to the match that Tierney was absent due to ‘muscle tightness’, while Mari was struggling with a ‘tight calf’.
Arteta said: ‘KT had some muscle soreness, he hasn’t recovered well. He wasn’t comfortable to start the game and, in this period, we cannot take the risk.’
Scotland international Tierney has been one of Arsenal’s best players this season, while Mari has begun to impress after missing the start of the campaign with an injury.
While Tierney and Mari were absent, Arsenal fans will be glad to see summer signings Thomas Partey and Gabriel make the bench following their lay-offs. Arteta added: ‘Gabriel is feeling much better, he had a complete week of training.
Thomas has been trying to push us for a week or so as well and I think he can get some minutes today as well.
‘It’s good news to get some people back. It’s true that we’ve lost three or four as well but this is part of the Premier League.’
Ahead of the Crystal Palace match, Arsenal star Hector Bellerin said: ‘We’re feeling really good. It’s great to find some momentum in our games, not just in the league but also in the cup.
Loads of great performances, loads of positive so I’m glad we’re turning it around.
It’s time for us to keep going, we play at home, our favourite place, so it’s our chance to do it again tonight.’ On Palace, Bellerin added: ‘They are a team that are very good playing away from home, especially against the bigger teams.
‘Even though they haven’t been on the best of runs, we know it’s going to be a tough games as they’re organised, really physical and they have great players up top. We expect a big fight but we’re ready to take