An agreement in principle was struck on Thursday night between the clubs for an initial £28.4million (33.5m) transfer with a further £4.2m in add-ons.
Merino has arrived in London to complete the move ahead of Arsenal's trip to Aston Villa on Saturday night.
The 28-year-old was involved throughout Spain's successful Euro 2024 campaign, scoring the extra-time winner in the quarter-final against Germany.
He has 28 caps and spent a season at Newcastle under Rafael Benitez before joining Real Sociedad, where he has made 242 appearances.
Merino will add depth to Arsenal's midfield as they look to win a first Premier League title since 2004
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