
He has Premier League experience having spent a two-year spell at Aston Villa, leaving in 2016.
"I chose to come here because, first, it is the Premier League, second, it's a lovely club and the fans are always helping the club and, third, for me it's an unbelievable opportunity and an fantastic project the club are leading, being ambitious and keen to achieve good things", said Sanchez.
He was later loaned back to the Spanish side the following season.
Perez scored seven times in 21 appearances for Arsenal, including a hat-trick in the Champions League away to Basel.
Wilshere - who also made the move from north to east London this summer - had posted an Instagram post before any confirmation from either club, which showed Perez in a West Ham kit, most likely in the changing rooms at the Hammers training facilities.
Arsenal are said to be keen to cash in on Perez and Emery has reportedly warned both the Spaniard and fellow striker Danny Welbeck that they will have minimal game-time if they stay at the club this summer.
More news: Actor Steven Seagal Appointed Russian Ministry’s As ‘Special Representative’'I wish you all the best for the future and I hope you can go and achieve great things'.
West Ham director of football Mario Husillos is confident Perez will prove another valuable addition.
With the Baggies unable to offer Premier League football like West Ham, they would have to convince him to turn down a move to London.
The Hammers have been leading the way, with Manuel Pellegrini looking to continue a busy summer of spending.
Perez managed to score eight goals in 35 matches for Deportivo who have been relegated into the Segunda division in Spain last season.
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