It remains to be seen whether the duo will be in contention to for Saturday's Premier League trip to Huddersfield but it's a big boost to have them back in training as they should be available again soon.
The Gunners are now sixth and look like missing out on Champions League qualification for the third year running.
A 2-1 win at Bournemouth on November 25 was the last time Emery's side took three points on the road, but Huddersfield look the flawless opponents after losing 11 of their past 12 league games.
Arsenal head to the John Smiths' Stadium sitting sixth in the table and three points off the top four following the loss at City last time out so we desperately need to get back to winning ways on Saturday.
"My first critic is always myself", he said.
Denis Suarez came on as a substitute against Man City but the new arrival should make his first team start during the Huddersfield vs Arsenal game.
It would be recalled that a former player questioned why the Arsenal board sacked former manager Arsene Wenger if they are also not ready to turn a new leaf.
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Philadelphia will receive Jonathon Simmons , a first-round pick and a second-round pick in exchange for the 20-year-old guard. But, he also dealt with injuries as well as a hitch in his jump shot during his rookie season, which limited him to 14 games.
"This week he worked Monday with our coaches and also yesterday".
He noted: "Just a few weeks ago, United were obviously behind us but it's happened and it's something we have to deal with".
"We can have better balance [in performances] when we prepare by thinking it's going to be very hard", Emery said.
"Today he is working with different adaptation and better than last week. The first is to think we need to win and after it's how we can win this match - (in terms of) preparing tactically and individually".
"I hope he's continuing to improve every day".
"We have to continue in our way with passion and also stay calm, but above all we must work hard and take a good feeling in training and then show it in the match".