Ex-Swansea striker Michu joins fourth-tier side
The 29-year-old was released by Swansea City last month after a long-standing ankle problem limited him to just 29 appearances over the past two seasons, which included spending last term on loan at Napoli.
"Langreo have reached an agreement to secure the services of forward Michu," the club said in a statement, adding that he could make his debut once the Spanish transfer window reopens on January 4.
Michu was an instant hit after signing for Swansea from Rayo Vallecano in July 2012, top-scoring with 22 goals in his first season as Swansea won the League Cup.
He earned his first and only Spain cap in a World Cup qualifier against Belarus in October 2013, but had not played for Swansea since April 2014.
A change of scenery in Italy failed to help Michu rediscover his old form as he featured just five times for Napoli without scoring a single goal.