Arsenal’s Petr Cech was in a mood on Monday as minutes after firing off a riposte to Bayern Leverkusen for what he perceived to be an insult, the Czech veteran casually shut down a troll on Twitter with just one line.

First, some context.

On Sunday, Arsenal were humbled in their own backyard as defending champions Manchester City beat them 2-0 in their season opener.

While Cech was among the few Arsenal players to have a decent game, he struggled to cope with City’s high pressing and new coach Unai Emery’s insistence of playing your way out of trouble, instead of hoofing it at the first sign of danger.

One Arsenal fan inadvertently kickstarted a raging debate on Twitter when he posted this unflattering GIF of Cech attempting to play the ball out:

With summer signing Bernd Leno waiting in the wings, speculation is rife that the German custodian will eventually take over the No.1 jersey at Arsenal.

And his former club, Bayer Leverkusen, had a cheeky response to the aforementioned tweet:

Leaving no doubt that they were in fact referring to Leno, Bayer tweeted this video of a rapid counter-attack:

Cech took umbrage at the jokes being made at his expense and his terse statement effectively shut down all the trolls:

However, one twitter user remained defiant and actually made an astonishing claim:

The troll, who goes by the twitter handle registability, is a UEFA B-Licence coach and a psychologist, according to their profile bio.

Cech wasn’t impressed and responded with a terse one-liner:

The troll remained unfazed, however, and had another jibe to add:

Cech didn’t respond to this latest escalation, but it’s safe to assume he doesn’t agree with that line of though.

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With an away clash at crosstown rivals Chelsea looming large, Gunners fans will hope Cech puts aside all the flak he’s receiving on social media and just focuses on training.

The Blues, also under a new coach with a different philosophy, thrashed Huddersfield Town 3-0 away on Saturday and will definitely be the more confident of the two sides when they resume rivalries on August 18.