The Little Jewel, as he is known back in his homeland, had been playing in the footballing backwater that is the UAE and arrived in the Premier League a complete unknown quantity.
Not to Slaven Bilic, though, who had been tracking the player for some time at previous club Besiktas and managed to land his services on loan with an option to buy.
The Hammers wasted little time in taking up that option when they made his deal permanent earlier this year.
Lanzini has weighed in with seven goals and as many assists this campaign as the Hammers finished just outside the Champions League places.
'We will try to continue to grow'
And he a post on social media site Instagram, Lanzini has thanked Bilic and made a promise to West Ham fans that there is even better to come from him and the team next season.
"The 2015/16 a season was full of emotions and satisfactions, in one of the best leagues in the world, I could adapt," Lanzini posted on Instagram.
"It was a great season for West Ham where we could take it to the top and we will try to continue to grow, thanks (to) my teammates and the coaching staff for this wonderful season (and being the best) leaders.
"Come on West Ham, come on you Irons!"
Temporada 15/16 la verdad q una temporada llena de emociones y satisfacciones, en una de las mejores ligas del mundo me supe adaptar gracias a dios. Fue una gran temporada para el west Ham donde pudimos llevarlo hasta lo más alto y vamos a tratar de seguir creciendo, el objetivo está más q hecho y doy gracias a mis compañeros el cuerpo técnico y los dirigentes por esta temporada maravillosa q me tocó vivir !!! Vamos west Ham ⚒ // Season 15/16 a season full of emotions and satisfactions , in one of the best leagues in the world I could adapt me. It was a great season for West Ham where we could take it to the top and we will try to continue to grow, thank my teammates and the coaching staff for this wonderful season leaders q I lived !!! Come on West Ham ⚒ #COYI
Lanzini will have the best possible stage to show his array of skills and help the East Londoners grow when they take to the field in front of 60,000 people at the Olympic Stadium next season.
And should Manchester United win the FA Cup final against Crystal Palace, they will be playing in the Europa League too, a fitting achievement for what was the club's best season since 1985/86.