Brentford are in talks with Club Brugge over discount for winger Antonio Nusa after issues with his medical.
The Bees had agreed a £31.5million deal to sign the 18-year-old Norway international on Monday but they are now trying to renegotiate the fee.
Brentford have sought to seek more medical information from Club Brugge and the Norwegian Football Federation.
Nusa had agreed a move to Brentford after they hijacked Tottenham's move for him, but it now remains to be seen whether Club Brugge will grant Brentford a discount before tomorrow's transfer deadline.
Brentford's offer of guaranteed regular first-team football, along with the desired loan back to Brugge until the end of the season, swung a fierce race in the Bees' favour.
Chelsea are among 20 clubs who have been tracking Nusa, having had a £23m bid rejected in September, but fitness concerns could dampen some of the excitement around the teenage talent.
Nusa has scored four goals and registered three assists in 28 matches in all competitions this season and made his international debut in September.
