With deals for Wilfried Bony - a club-record £12 million arrival from Vitesse - and Jonjo Shelvey among those completed early, the club made just one signing on deadline day that saw them bring in Getafe forward Alvaro Vazquez on loan.
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"I think our signings this summer were very good," Michu told the club's official website. "We are stronger this year.
"Everybody is speaking Spanish in the changing rooms now! Michael knows these players, but I'm very happy, not only with the Spanish signings, but with all the signings this summer.
"When you play with high quality players, it's easy to play. They help you a lot."
The Swans face a more tightly packed season of fixtures in 2013-14 after qualifying for the group stage of the Europa League but the Spaniard is unafraid of the extra matches, seeing it as an opportunity to be enjoyed.
"We are going to enjoy it. For me, to play a game is the best part in football," he added. "Even if we had 100 games this year, it’s better for the team."