Spanish newspaper Marca claim 14-year-old goalkeeper Jose Mario has signed on at Craven Cottage after a one-month trial.
He played for Real Madrid's Canillas side when his father was manager there, but it looks like he has not followed his father following his move back to Chelsea.
Fulham would not comment on the speculation when contacted by Press Association Sport.
"Fulham Football Club does not comment on the identity of any of the young people participating in the numerous football programmes on offer at the club," a statement read.
Source: PA
Source: PA