‘Irreplaceable' is a term often overused to describe modern day Premier League footballers and their significance to their relevant clubs.
It's frequently used as a term to show resilience in the transfer market and indicate a club's reluctance to sell rather than an acknowledgement of a player's true worth to the cause.
But in West Ham‘s rather unique case with Manuel Lanzini it really is the perfect word to describe the Argentine's importance to any potential long-term success at the London Stadium.
Slaven Bilić has not hidden from that fact. Liverpool‘s interest may have cooled now Barcelona appear to have given up on Philippe Coutinho but this should serve as a severe warning for the Croatian going forward.
Nurturing meticulously in the shadow of Dimitri Payet, Lanzini exploded onto the scene as West Ham's main man last season – before the Payet debacle had even been resolved.
A 3-0 victory over Crystal Palace in January came amid the controversy surrounding the Frenchman's future and Lanzini stepped up to the plate in typical fashion to leave Bilić under no illusion Lanzini could fulfil the void left by the great Payet.
The smile on Bilić's face in that particular post-match press conference encapsulated a man who had had a weight lifted off his shoulders, knowing Lanzini's quality could propel the Hammers forward post-Payet.
And since then, the 24-year-old has demonstrated exactly why he is so highly thought of in east London.
Not known for his goalscoring attributes, Lanzini endeared himself further to the West Ham faithful grabbing the only goal of the game to all but end Tottenham's Premier League title hopes last season.
But it's his creative knack of carrying the ball from midfield where he really shines.
Relieving pressure on the defence, Lanzini can be credited as being one of the best dribblers in the league and exhibits a blistering turn of pace to transform a defensive problem into a promising counter-attack.
It's little surprise that Lanzini's injury spell on the sidelines has coincided with West Ham's dismal start to the season.
Even so, Bilić has revealed that daily conversations with his creative star leave no doubts in his mind that Lanzini is in it for the long-haul at the London Stadium.
“I speak to Manu everyday, he's very happy. He really feels at home here and feels wanted,” Bilić said.
“You know you can feel it, you can see it. You don't have to talk to the players. You can see how he's always smiling here.”
Bilic's faith and show of support for Lanzini has been replicated on the international stage by Jorge Sampaoli, who has selected the midfielder for Argentina's upcoming World Cup qualifiers, despite his injury problems.
The 24-year-old, who has been sidelined with a leg injury picked up in pre-season, is back in full training this week just in time for the trip to Newcastle, before he jets off to try and help Argentina stabilise their faltering World Cup qualifying campaign.
“He broke into the national team of Argentina despite being injured,” Bilić continued.
“He's got a call-up for the games in September. So he knows that ‘if I'm playing here with West Ham and have a good season I have a chance to improve, sign a better contract and to play for Argentina.'
“I'm sure he's going to stay with us. He knows that he's wanted. As I said, the chairmen and the board took an option to sign him permanently before the end of his loan spell here.
“He was voted the Players' Player of the Year and it makes you feel very wanted at the place. He likes it here.”
West Ham fans will be delighted with Bilić's latest revelations but in a season that could define the Croatian's reign, he will need Lanzini fit and firing as soon as possible.
At the time, losing Payet in the manner they did came as a bitter blow but the optimism and positive reverberations around the London Stadium are still in place, thanks in large part to one particularly brilliant little Argentine magician.