Yoane Wissa has returned to the UK from Brentford's pre-season training camp for talks with the club's hierarchy over his future, amid a new bid from Newcastle.
Brentford are understood to have rejected an offer of £25m from the Magpies. Direct talks remain ongoing and a new offer is expected.
Wissa, aged 28, does not want to miss out on the opportunity to play Champions League football.
He has one year left on his Brentford deal with a one-year option, and has told Brentford he is keen to explore a move to Newcastle.
Brentford do not want to sell Wissa after selling Bryan Mbeumo to Manchester United last week in a deal worth up to £71m. They feel it would be too much of a risk to let both their best forwards go in the same window.
Wissa replaced the departing Ivan Toney as Brentford's main No 9 last season, scoring 19 Premier League goals - all from open play.
Newcastle are on the look-out for a new striker after missing out on Frankfurt's Hugo Ekitike, who is currently close to joining Liverpool for around £79m.
Newcastle United transfers
In
Anthony Elanga - Nottingham Forest, £55m
Antonio Cordero - Malaga, free transfer
Out
Lloyd Kelly - Juventus, £20m
Jamal Lewis - released
Callum Wilson - released
Sean Longstaff - Leeds, £12m