The pair followed the footsteps of Arouna Kone, who had already left Wigan to join his old manager.
Alcaraz was out of contract at the club, whilst Robles was on loan at Wigan last year and joins Everton from Atletico Madrid.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.