It was seen as a fairly uninspiring signing at the time, Michu joined for just £3 million from Rayo Vallecano, after spending just one season in La Liga.
The Spanish forward was pretty unheard of by Premier League fans, and little was expected of the 25-year-old in the club's second season in the top tier.
But everything would change on a quite remarkable opening day of the season.
On his Premier League debut against Queens Park Rangers at a packed out Loftus Road, the Spanish striker scored twice and provided an assist in a 5-0 drubbing.
It was the start of a season to remember for the former Celta Vigo forward.
He maintained that level of goalscoring form for the rest of the campaign, bagging a mightily impressive 22 goals in all competitions.
Swansea finished in 9th place and would lift the League Cup under Michael Laudrup, their first major trophy win.
It's fair to say Michu played a huge part in that success. He was simply sensational in his first season and a result of his fine form, he received a call-up to the Spain national team, and would go on to play alongside the likes of Andres Iniesta, Xavi and Carles Puyol.
But like many before him, the Spaniard struggled to replicate his 18-goal haul in the Premier League following his breakthrough campaign, managing just two goals in 2013/14.
But here's that compilation of all his goals in a Swansea jersey.
The former Real Oviedo man was subsequently loaned to Napoli in Serie A, before being released from his contract in November 2015.
Shortly after leaving the glitz and glamour of the Premier League, he signed for Austrian side Langreo, and later returned to boyhood club Real Oviedo in the Segunda division.
But again, he never quite recaptured the form of 2012/13 and retired three years later because of injuries, aged 31.
He came from nowhere to light up the Premier League with Swansea and even managed to earn one cap for the Spanish national team at a time where they had a golden generation of players.
Even Erling Haaland is a huge fan of the striker, which is a hell of a player to have idolise you really. It tells you all you need to know of the Premier League's greatest one season wonder.
What are your favourite memories of Michu?
Let us know in the comments.
Featured Image Credit: Swansea City
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