Fierce feisty and free-spirited - this list includes players who could strike trepidation into their own managers as well as rival teams.
Some - like Paul Pogba and Luis Suarez - are legends whose careers in England were marred by controversy amid their brilliance.
Others - such as Pierre-Emerick Aubameyang - had long spells inspiring awe blotted by sudden revelations.
And a few - step forward Virgil van Dijk - have long-forgotten incidents in their Prem CV.
There's also the public spats - none more dramatic than Jadon Sancho's with his Manchester United boss Erik ten Hag.
But all of them have been banished from club training at some time.
The numbers easily run into 'trouble figures' - but here's our guide to how ten of these players were forced into solo practice and the effect it had on their careers.
The England winger's Old Trafford future was threatened by a remarkable exchange with Ten Hag.
Sancho's omission from a match squad at Arsenal in September 2023 was put down to poor training by his Dutch manager.
The 23-year-old hit back on social media at the "completely untrue" claims and added: "I've been a scapegoat for a long time."
Sancho deleted his post days later during an international break - when United players were given a week off training.
The Red Devils then gave him an individual training plan - as club chiefs reportedly discussed if he should play for them again.
From iconic goalscorer and skipper to sudden outcast - the Gabon hero's Arsenal stint deteriorated rapidly after what boss Mikel Arteta called his "latest disciplinary breach".
The striker was stripped of the club captaincy for reportedly returning late after being given a day's leave to visit his family in France back in December 2021.
But amid other
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