Aaron Hickey is set to undergo a medical in the UK on Tuesday ahead of his proposed transfer to Brentford.
A fee in the region of £14m plus add-ons is understood to have been agreed between the clubs.
Rushhoursport exclusively revealed Brentford's interest in Hickey in January - and they attempted to sign him then.
He made his senior Scotland debut in a 1-1 draw with Poland in March.
The west London club are also close to a deal with Hull for Keane Lewis-Potter, as Sky Sports News also exclusively revealed on Friday. Brentford have made Hull a significant offer and the player wants to join the Bees.
