Martin O'Neill has added FC Groningen's Virgil van Dijk, 21, and Kader Mangane, 29, of Al Hilal to his list of targets.
Van Dijk (pictured right): "I'm aware of the interest of a few clubs and Everton is one of them'.
"I hear and read a lot. Soon I have dinner with my agent Henk-Maarten Chin. He will tell me how things are going.
"I enjoy the interest, but if I leave it must be a good decision when I leave."
Mangane, who has six caps for Senegal, left French club Rennes last summer to join the Saudi Arabian outfit Al Hilal.
The 6' 5" former Senegal international, who has been a target for West Ham and Arsenal.
He was suspended for two months for breaking the leg of Valenciennes midfielder Jonathan Lacourt.
Al Hilal president Prince Abdulrahman: "Today we received the official bid from Sunderland for Mangane, we will look into the offer and consider our position and we may see the player leave Al-Hilal this month."