Chelsea are pushing hard to beat Manchester United to the signing of Sporting CP attacker Joao Mario.
A Bola says a Blues representative met with Mario's representative Kia Joorabchian in Portugal to discuss a transfer fee.
Antonio Conte is on the hunt for new midfielder to strengthen Chelsea's midfield and reports of his initial interest surfaced last week.
The Daily Star says United have been alerted to Chelsea's challenge and are willing to meet Sporting Lisbon's asking price or his £45m release clause.
It is understood United have held a series of talks with Mario's reps and are confident of striking a deal.