Stephen Ireland opened City's fire in dying moments of the first half after a Gael Clichy mistake in the Arsenal defense.
Robinho doubled the lead 11 minutes after the break from a superb pass from Shaun Wright-Phillips before Daniel Sturridge earned and converted a late penalty to give City a comfortable rebound.
Wenger was reluctant to talk about Gallas absence but confirmed that the 31-year-old still had a place in the team.
"Of course he has a future at the club, but the less we talk the better it is," he said.
"I will not speak about William Gallas in a post-match interview. He is a player who did not play today, so what can he do? Nothing," he added.
Chelsea could have grabbed three points, creating enough chances, but Newcastle's stout defense saw Luiz Felipe Scolari's side fail to win at home for the third time in four games.
Frank Lampard was denied by a stunning Shay Given save and Ashley Cole and Branislav Ivanovic both went close.
Chelsea also lacked a bit of luck as Joe Cole had a goal disallowed for offside.
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2020-09-15
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