Chelsea's deal for Boavista kid Aliu Djalo could be worth up to £5 million.
The Mirror says Stamford Bridge chief executive Peter Kenyon has set up a downpayment for the 17-year-old, with the fee rising to as much as £5m should he force his way into the first team and win trophies with the Blues.
The youngster was born in Guinea Bissau, West Africa, but has a Portuguese passport and his adopted father, Mamadu Bobo Djalo, is on the coaching staff at Boavista.
However, the Portuguese FA have been keen for Djalo to stay in Portugal to ensure he becomes eligible to play for their national team. If moves to Chelsea now, he could play for England in the future.