Walker was excused in the 2-1 loss in his side's last Champions League bunch stage apparatus on 7 December.
City had effectively equipped for the last 16 when Walker's 82nd-minute kick at Andre Silva caused a three-match boycott.
"Whenever a player does something dumb, he should be restricted for three games," Guardiola said.
"I'm not so kind to Kyle in this sort of activity," the Spaniard added. "I'm still so irate with him."
Group news: Guardiola faces protective cerebral pain
As per Guardiola, who disagreed with the club's choice to claim against Walker's boycott, City have only 14 players accessible for the second leg of their Champions League last-16 tie against Sporting Lisbon on Wednesday.
The drained Premier League pioneers are, be that as it may, 5-0 up after the main leg in Portugal in February.
"It's not important to talk about [it] with him. Kyle is so significant for us, you saw the game he played against [Manchester] United, however in Leipzig when we had qualified, 80 minutes in and he made this sort of activity? He merits the three games," Guardiola said.
"The club pursued however I disagreed. They needed to do this is on the grounds that in other comparative cases it was only two games [but] he merited it. Ideally he learns for what's to come."
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