Both footballers have a contract until June 2014, and seeing they are highly unlikely to sign new deal at Amsterdam ArenA, club chiefs have no option but to sell them at the end of the season.
Liverpool are believed to be leading the race for Eriksen, with the Reds in desperate need of a creative midfielder, although other top clubs are also keen.
The Denmark international continues to impress in Dutch Eredivisie, having scored 6 goals and set up 6 more in 21 league fixtures this term.
Toby Alderweireld, 23, is a cultured centre-back who looks ready for a new challenge in his career, and he could follow his former teammate Jan Vertonghen to Tottenham.
Newcastle are another team interested in the player who already has 112 Eredivisie appearances to his name.