But the Spaniard kept his cool when asked about his former PSG playmaker Hatem Ben Arfa's taunts after the first leg.
Leading last week through Alex Iwobi's early cross-shot, the Gunners crumbled once defender Sokratis Papastathopoulos saw red on 41 minutes for a second booking.
Emery said: "We need to be together and create a big atmosphere in the Emirates with our supporters to help us to do the best performance possible.
"I want to play matches that are difficult. We need to play with high emotion with our supporters but taking decisions on the pitch cleverly."
Rennes midfielder Ben Arfa could not resist a dig after his influential first-leg display.
The former France and Newcastle star said: "My motivation was to play a solid match, to win and get ourselves into a good position to go through.
"But I did see the same Emery, as agitated as ever. I looked over at him a few times and that made me laugh a little. He hasn’t changed."
Emery, though, tried to take the sting out of the situation today.
He said: "He’s a very good player and we respect him a lot.
"My focus is on preparing for the match against Rennes and on each player with his quality."
Emery will also guard his side against over-confidence following Arsenal's run of nine home Premier League wins in a row.
He said: "We need to focus on tomorrow and create a very emotional moment in 90 minutes with our supporters."
Emery added: "We are very demanding of ourselves… we want to play big matches, tough matches against the best teams.
"And in the Europa League we are finding some results like the last round against BATE Borisov with difficulty.
"This round is the same with a bad result in the first match and for us it's a tough match."
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