Brentford are hoping to complete a deal for long-term target Ollie Watkins.
The Bees have held talks with Exeter about signing the 21-year-old but the clubs are yet to reach an agreement.
Watkins, 21, has scored 26 goals in 78 appearances for the Grecians and the Bees considered a move for him in January, when they lost Scott Hogan to Aston Villa.
Brentford, who also sold Philipp Hofmann earlier this summer, want to sign two strikers and are set to complete the signing of France Under-21 international Neal Maupay.
They are also prepared to listen to offers for Lasse Vibe, who has entered the final year of his contract