The 26-year-old is not expected to make a decision his future until after Senegal's 2026 FIFA World Cup campaign with the African giants facing a group stage exit after losses to France and Norway.
Ndiaye has been a vital creative force in David Moyes' team with nine goal involvements in each of the last two Premier League seasons - but there is major speculation over his future - despite being under contract on Merseyside until 2029.
Everton are keen to secure the former Marseille midfielder to a new deal with a significant wage rise, but despite being in regular talks since the start of the year, his representatives have rejected several contract offers with his transfer value set at £70M by the Toffees.
The player himself has also expressed an interest to play in the UEFA Champions League after Everton failed to secure European qualification in their first season at the Hill Dickinson Stadium.
Manchester United are rumoured to be tracking him as an option - with Marcus Rashford expected to follow Jadon Sancho through the Old Trafford exit door - and ex-Senegal star Henri Camara has told Ndiaye not to miss his chance if it arrives in the weeks ahead.
"If he keeps going like this, he can go far and play for a bigger club, he has incredible talent. Every time I watch him play, it makes me happy. If a big club needs him, he shouldn’t hesitate, he should leave," he told Parimatch UK Sportsbook.
"If you play for a team that isn’t winning trophies, it’s difficult. He dreams of winning trophies, so if a big club comes for him, he has to leave to go and win things."