Arsenal have already booked their spot in the knockout stages, meaning Emery is likely to give plenty of youngsters an outing at the Emirates - as he did against Vorskla Poltava in Kiev last month.
"We give young players the chance to train with us, we give chances like today when we can and they show us positive things", the Gunners boss said.
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Maurizio Sarri has moved Kante out of his deep-lying midfield role this season and called on the World Cup victor to score more. And he's gone on to play at a fantastic level. "We had a lot of humility and tried to take our chances to score".
Koscielny was visibly delighted to make his return, telling BT Sport: 'Today was very important for me.
"Tomorrow is a good day for a lot of players - in the group we are first but we want to win, and also with a good performance".
"Then we are going to wait and see how Mavropanos is improving with his injuries, because he is also a centre-back who can help us".
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Offshoot movements have emerged elsewhere, and yellow-vest protests are planned on Saturday in Belgium and the Netherlands. Christmas markets, national football matches and countless other events have been cancelled or duisrupted by the protests.
We have some players with injuries and unavailable at centre-back. When he is coming back like today every supporter is happy, as are the players.
"He can take confidence again, take rhythm and then we are going to continue our process". That could mean Koscielny will be asked to play twice in four days.
"It hurts to talk about it, it hurts to think about it, but that's why I think it's so important that we need to get rid of it in the game".
Arsenal provisional squad: Leno, Martinez, Cech, Bellerin, Jenkinson, Lichtsteiner, Koscielny, Papastathopoulos, Medley, Monreal, Kolasinac, Xhaka, Elneny, Gilmour, Torreira, Willock, Maitland-Niles, Guendouzi, Ramsey, Smith Rowe, Iwobi, Ozil, Mkhitaryan, Lacazette, Aubameyang, Saka, Nketiah. Because [the youngsters] can play better if you have with you also players to help you on the pitch.
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All three men were playing for the Venezuela Winter League club Cardenales de Lara. Carlos Rivero , who played briefly with the Red Sox in 2014, was injured.