Fernandez arrived at Chelsea earlier this week to round off a whirlwind six months in which he moved to Benfica from River Plate, instantly starred in the league and the Champions League, and then played a vital role as Argentina won the World Cup with a dramatic triumph over France.

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Potter acknowledged Fernandez’s rise to the top has been a quick one and a period of assimilation is required, but he is in no doubt the midfielder has what it takes to be a hit in west London.

‘He’s still young, coming to this country you have to adapt, you have adapt to the club, so it doesn’t matter what the fee is, that still has to happen, but we will help him with that,’ said Potter.

‘And his personality is one that makes you think you have no concerns with him. He’s a fighter. He understands how fortunate he is. He fights for the team, he’s not afraid, he’s got courage, he’s open-minded, he wants to improve.

‘If you can play in the six for Argentina, and play in the big games he has, at his age, and with the quality he has shown, it’s not straightforward.’

The fee that secured Fernandez’s signature has garnered plenty of interest in the media. Potter wanted to point out such figures are to be expected in this day and age, and he reiterated his confidence in the 22-year-old’s mentality at this transitional period in his life.

‘Every transfer is a gamble. If you look at the market for midfield players, certainly players that haven’t won the World Cup, you will be quoted a lot of money. That’s the reality.

‘We have a player with a huge personality. He has attributes that can play in any league in the world. He has played well in the Champions League. We followed him before the World Cup, we knew about him anyway, so we’re confident in his personality.’