The Premier League are reported to have paid £26million to sign the 22-year-old, who appeared in all five of Uruguay's matches at the World Cup.
The club announced the signing on Tuesday afternoon, with Emery delighted to add Torreira to his squad.
While Chinyere wished him "immense success" during his time at the Emirates, Mario Piso already guaranteed a "great 2018/19" season. "We welcome Lucas to Arsenal and look forward to him joining us soon for pre-season".
On signing for the North London outfit, Guendouzi told the club's website: 'It's something I'm immensely proud of. It's a very positive thing that people want to welcome me.
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The former Sunderland player posted a photo on Instagram signing his deal, writing that "today is the start of a new chapter in my life".
The 5ft 6in holding midfielder flew to London earlier in the week to undergo a medical, and his acquisition will be seen as a huge boost to the club following the recent departure of Jack Wilshere to West Ham.
No official indication has been made over the length of the contract while the transfer remains subject to "regulatory" global clearance.
"I want to become part of the club's history and to achieve great things here", said midfielder Guendouzi.
Unai Emery insists new signing Matteo Guendouzi will fight for a first team place this season.
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Relishing the suspense, Trump insisted he still hadn't locked down his decision, which he wants to keep under wraps until a 9 p.m. Ahead of the announcement, three names surfaced as the contenders - Amy Coney Barrett , Kavanaugh and Raymond Kethledge .
United Kingdom in turmoil, says Trump, won't back May
Trump has, meanwhile, delivered on US commitments to Europe. "Charge us big Tariffs (& Barriers)!" he wrote on Twitter . Trump while the president was en route to Brussels . "And dear Europe, spend more on your defense", he said .
Henderson hopeful on fitness for World Cup semi-final
England too left Italy 28 years ago feeling that the team featuring Gary Lineker and Paul Gascoigne could have gone all the way. As we regroup, he turns to me and says, "right that's enough, time to lift the tempo, let's get about them".
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Last night, Thai navy SEALs posted a celebratory note on their Facebook page, saying: "Have sweet dreams everyone". Monsoon flooding blocked their exit route and prevented rescuers from reaching them for almost 10 days.