The phrase "it's just not cricket" is used in English to say that something is unfair or dishonest.
I can't believe you got a ticket for the party and I didn't. It's just not cricket.
You can't copy your essay from the internet! It's just not cricket.
Diana admitted that she cheated in her A Level exams to get a place in a top university. It's just not cricket.
It's just not on: Another way of saying that something is unfair or unacceptable is "it's just not on."
Example:
Peter calls in sick every Monday – it's just not on.
The Indian Premier League is a professional league for Twenty20 cricket, a shorter form of the game which consists of only 20 overs. Nine teams take part in the league, with players from all over the world.
It's just not cricket: Böyle de olmaz ki!
It's just not on: Haksızlık bu!