Arsenal goalkeeper Petr Cech accused Bayer Leverkusen of lacking "professionalism and sportsmanship" after he was the subject of some social media jibes from the Bundesliga club.
Cech started for Arsenal in the 2-0 home defeat against Manchester City in their first Premier League game under new head coach Unai Emery on Sunday.
The result could have been even worse when, after receiving a back-pass from debutant Matteo Guendouzi, Cech passed the ball straight out of play for a corner, narrowly missing his own right-hand post.
Leverkusen's English Twitter account responded by posting a video of Bernd Leno – who joined Arsenal from the Bundesliga club in pre-season – beginning a passing move that ultimately led to a goal, with the caption reading: "In case you were wondering how to play out of the back".
In case you all were wondering how to play out of the back... pic.twitter.com/LZkxznsGPs— Bayer 04 Leverkusen (@bayer04_en) August 12, 2018
Cech failed to see the funny side, however, taking aim at Leverkusen in a post on Monday while also praising his current club.
Taking to his official Twitter account, the former Chelsea keeper wrote: "At Arsenal, we share important values which make us a big club, not only on the football side.
"Fair competition, professionalism and sportsmanship are the biggest ones you teach young footballers and it's sad to see when other clubs don't share the same values. @bayer04_en."
.@Arsenal we share important values which make us a big club not only on the football side . Fair competition, professionalism and sportsmanship are the biggest ones you teach young footballers and it’s sad to see when other clubs don’t share the same values. .@bayer04_en— Petr Cech (@PetrCech) August 13, 2018
After Cech's response, Leverkusen issued a swift apology in a reply to the goalkeeper's message.
"Hi Petr. It seems our joke about wanting to see Leno, our former player, in action has been taken a bit more harshly/personally than intended," Leverkusen posted on Twitter.
"It was only a bit of banter. We’re all for the values you’ve stated and wish you and your big club all the best. Nice 1v1 save on Aguero!"
|Smith on his NBA Finals miscue: People make mistakes all the time|
|Rams CB Talib to have ankle surgery|
|Cousins ´feeling a lot better´, still unsure when he´ll return|
|I knew we´d be in trouble with Jones on penalties – Mourinho|
|Coyotes forward Galchenyuk expected to miss opener|
|Guardiola won´t compare Foden to Iniesta|
|Lampard shell-shocked as Derby win at Old Trafford|
|Ryder Cup 2018: USA celebrities take the honours|
|Manchester United´s torrid penalty shoot-out run continues against Derby|
|Guardiola: Foden already a great, great player|
|Atletico Madrid 3 Huesca 0: Rojiblancos cruise ahead of Madrid derby|
|EFL Cup: Lampard dumps out Mourinho, Burnley lose at Burton Albion|
|Mourinho denies Pogba row despite stripping midfielder of vice-captaincy|
|Fabinho situation not complicated, insists Klopp|
|Manchester United 2 Derby County 2 (Derby win 8-7 on pens): Lampard heaps pressure on Mourinho|
|Afghanistan snatch tie after Shahzad pummels India|
|Inter 2 Fiorentina 1: D´Ambrosio maintains Nerazzurri revival|
|Oxford United 0 Manchester City 3: Foden stars as EFL Cup holders cruise into round four|
|Cousin takes Gabon post after Aubameyang rejection|
|Bayern Munich 1 Augsburg 1: Neuer error costs champions|
|Paris Saint-Germain must be a Champions League force to help Neymar - Baptista|
|Salgado warns of ´war´ in Spanish football|
|Cech deserves Arsenal place, says Seaman|
|Halep and Garcia among seeds to fall in Wuhan|
|F1 Raceweek: Mercedes taking no comfort in points advantage|
|Benitez charged by FA for referee comment relating to Zaha treatment|
|Cibulkova dumps out hampered Halep in Wuhan|
|Mourinho questions his players amid reports Pogba won´t captain United again|
|European Ryder Cup diary: Fleetwood´s hair delights Poulter|
|USA Ryder Cup diary: Tiger´s roaring reception, McEnroe´s bold prediction|
|Loans to be limited under new FIFA proposal|
|Prolific Nadolo signs new Montpellier contract|
|Modric? For us, Messi is the best – Valverde|
|Murray makes winning start in Shenzhen|
|Mickelson would cherish first victory on European soil|
|Hodge hoping pressure proves too much for South Africa|
|Woodward in show of support for under-fire Mourinho|
|Mickelson jokes he wants ´a shot a side´ from Tiger in Thanksgiving showdown|
|Reed: Captain America is a villain in Europe|
|Duminy to captain Proteas as Elgar replaces injured Amla|
|No Tottenham timeline for Lloris, Vorm returns|
|Woods ready for ´awesome environment´ on Ryder Cup opening hole|
|Tony Bellew determined to prove doubters wrong against Oleksandr Usyk|
|Tuchel explains why he likes Neymar at number 10|
|Manchester United smash revenue record but profits down|
|Furyk downplays Ryder Cup pairings talk, says Tuesday is about individuals|
|Rejuvenated Tiger out to improve poor Ryder Cup record|
|Saunders fined £100,000 for ´sickening´ online video|
|Hazard can reach his full potential with Sarri´s Chelsea - Zola|
|Ryder Cup heading back in Europe´s direction, says Niall Horan|
|Wow! Klopp hails Sarri´s Chelsea transformation|
|Giovinazzi to partner Raikkonen at Sauber in 2019|
|Bjorn backs ´phenomenal´ Rahm to continue trend of Spanish success|
|Durant in no rush to decide Warriors future|
|Rossi to face anti-doping hearing|
|Mignolet to return for Liverpool against Chelsea|
|Premier League ´interesting´ for Germany boss Low|
|Wilder wins Twitter vote to be Joshua´s next opponent|
|BREAKING NEWS: Isco an El Derbi doubt due to appendicitis|
|Juventus won´t rest Ronaldo ahead of Napoli clash|
|Slater cleared to play in NRL Grand Final|
|Top seed Begu sent packing in Tashkent|
|This isn´t my last hurrah in Ryder Cup, insists Poulter|
|Barba back in NRL with North Queensland Cowboys|
|Arsenal wait on Mkhitaryan and Sokratis|
|All Blacks wary of Pumas pack ahead of Buenos Aires Test|
|Ryder Cup has special place in Pep Guardiola´s heart, says Fleetwood|
|Mbappe ready to take over from Messi and Ronaldo, says Trezeguet|
|Molinari: Ryder Cup pressure far outweighs any major|
|Koepka heads PGA Tour´s Player of the Year nominations|