West Ham United FC (@whufc_official) September 3, 2015
The highly rated shot Latvian Under 17 international already stands at an astonishing 6ft 7in despite being just 16-years-old.
Hammers chiefs moved quickly to get the youngster, who is rated as one of the most promising young goalkeepers in Europe, signed up to a scholarship with Slaven Bilic's side.
“I am really delighted to have a signed. I’ve worked hard for this, and it’s always nice to for that to be recognised.
“I found out I was signing the contract only a few days ago but it’s something I’ve been hoping would happen for a while now.
“I love training alongside Adrian and the other first team goalkeepers. It’s a great learning experience and I really enjoy it.
“Out of the strikers Andy Carroll has definitely got the hardest shot, the power he gets is unbelievable. I’ve saved a few of his shots; it’s always a great feeling when you make a save against a Premier League player of his quality.”
Did you know: Rihards Matrevics
The towering teenager lists Manuel Neuer and Thibaut Courtois as his goalkeeping idols and made his international debut last year against Belarus.
As the shot-stopper is under 18, the deal remains subject to FIFA approval and International clearance.
With around another five years of potential growing still to do, Matrevics could go on to beat the record of Kristof van Hout, a goalkeeper in the Belgian league, who is the tallest professional footballer of all time at an incredible 6 foot and 10 inches.
He is already not far off the Premier League's joint tallest ever player and fellow 'keeper, Costel Pantilimon, who is currently number two at Sunderland and measures 6ft 8in tall.
Pantilimon should serve as a warning
In fact Pantilimon should serve as a warning to young Matrevics in that a tall 'keeper is not necessarily guaranteed success.
To look at the Romanian former Manchester City player you would think he should be unbeatable.
While he has a reputation as a solid player, he was released by City and still cannot get a game at struggling Sunderland.
While he towers above even the tallest of strikers in the Premier League, he lacks mobility which impacts on his effectiveness in claiming balls from corners and also getting down low quickly enough to keep the opposition out.