The Premier League is brutally unforgiving.

Under the severe weight of pressure and expectation from fans and journalists alike, star performers one season can transform into chief scapegoats the next.

With the unremitting inflow of new signings, managers and systems, footballers are constantly removed from their comfort zones, forced to adapt to an environment in constant flux.

For those players recruited to England's top tier from various corners of the globe, this process is magnified – with shifts in culture, language and footballing ethos compounding the issue.

It's impossible to predict how each individual will acclimatise from season to season, but it's those that manage to that go on to forge a lasting legacy, a la Thierry Henry and Frank Lampard. In saying that, even the league's luminaries go through extended periods of poor form.

Let's take a look at four talented Premier League players who've played well below their best in the past nine months.

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