The versatile Italian full-back arrived at the Magpies in August 2011 for a reported fee of €6 million from Inter and after an injury-ravaged start he has since gone on to make the left-back position his own.
In January the defender was linked with a return to Italy with AC Milan, but nothing materialised and his agent Renzo Contratto does not believe that a move will materialise in the summer.
Contratto told Radio Crc: "I believe that Davide will remain in England because Newcastle want to count on him next season too.
"The club believe that he still has great room for improvement."
Santon has made 36 appearances for Alan Pardew's side in 2012-13 and scored his only goal of the season in last weekend's 2-1 loss to Wigan.