The 24-year-old has started just three La Liga matches for the high-flying Atleti since his move from Ajax in the summer.
He was linked with Liverpool, Spurs and Norwich at that time, but eventually opted to move to Spain to link up with Diego Simeone.
But he's since admitted that he misses Ajax and that he's not pleased to be missing out on first-team football.
Speaking to Sport-1, Alderweireld said: "I miss Ajax, their style of play, my ex-teammates - at Atleti, I can't be happy if I'm not playing.
"The team is doing well and I continue to fight for my place, but I don't think it's my fault."
Liverpool and Tottenham may now renew their interest in the £6.1m defender, with both expected to be busy in the January market.
Alderweireld is one of many Belgian internationals who will want first-team football heading into this summer's World Cup.
Belgium have been tipped by many to make a big impression at the tournament, but the likes of Alderweireld, Kevin de Bruyne, and Thomas Vermaelen are struggling for regular minutes.
De Bruyne moved this month to Wolfsburg in an effort to secure more playing time.