According to a Manchester City source (via Football Insider), Pep Guardiola was left unimpressed by Jack Grealish following their UEFA Champions League quarter-final tie with Atletico Madrid, with 

The lowdown: A feisty encounter

City became embroiled in a war of attrition with their Spanish counterparts over two legs, with the second clash at the Wanda Metropolitano particularly tension fuelled.

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Following a 1-0 success at the Etihad, the Citizens were able to advance to the semi-finals with a goalless draw in Spain but tensions boiled over in the closing stages.

Whilst warming up as a substitute, Grealish became embroiled in an altercation with Stefan Savic that would appear to have left Guardiola less than pleased...

The latest: Pep's angry

As per the FI source, the 51-year-old is believed to be 'unhappy' with his £100 million record signing being caught up in the antics of Diego Simeone's side.

It's claimed that Guardiola 'does not want any type of ill-discipline or provocative behaviour' in the Sky Blues squad.

Meanwhile, the report goes on to claim that the 20-cap England ace has 'complained' about a lack of the ball in his short City career to date.

The verdict: Unnecessary distraction

Albeit the fracas was almost certainly caused by the ferocious nature of the opposition, it's perhaps not a surprise that Guardiola, ever the consummate professional would rather his players steer clear of controversy.

In truth, ex-Aston Villa star Grealish has made a rather inauspicious start to life in Manchester, scoring five times and providing three assists in 33 appearances for the club.

This kind of matter will only act as an undue distraction as the 26-year-old attempts to become a regular feature in Guardiola's side and begin to impact on the big occasions after an FA Cup semi-final goal in vein against Liverpool.

In other news: German source makes exciting transfer claim involving City! Find out more here.