Schalke's Matondo spent last season on loan at Belgian club Cercle Brugge but an agreement on a permanent deal could not be reached.
But Matondo, in the Wales squad for today's World Cup play-off final, said: “There's always an appeal to be playing football in England.
“I grew up in the United Kingdom and, one day, if the opportunity is right, this summer or whenever, I'm open to it.
“As things stand, I'm a Schalke player. I'm here with Wales and whatever is getting done by my agent and family, we'll see what happens."