One of Man Utd, Liverpool and Chelsea have received encouragement over signing De Jong in January, while a transfer Arsenal avoided making has been branded a lucky escape
The 22-year-old has signed a five-year deal with the Eredivisie champions after the two sides agreed a fee for the powerful defender.
Ajax are poised to make three signings in quick succession including Calvin Bassey and a striker who has snubbed Man Utd.
TEAMtalk understands that central defender Humphreys has a host of clubs looking to seal his signature after leaving Belgian side Zulte Waregem
Gabby Agbonlahor has sent a rousing endorsement over Aston Villa target Calvin Bassey, noting the qualities that make him such a good asset
Gerrard has reportedly drawn up his summer shopping list at Villa, with six players wanted and Rangers' star Bassey one of his top targets
"Calvin Bassey, my word, what a performance."
Rangers and Frankfurt could not be separated after 120 minutes and it was the lottery of spot-kicks that won it for the Germans
The Villa boss has new defenders on his wanted list and after missing out on two top targets he could now turn to a player that he knows well.
West Ham want to follow in Everton's footsteps and snag a Rangers deal for a star the Hammers saw slip through their grasp in 2020.