The Saints attacker was 'disappointed' after being dropped by manager Nigel Adkins for the clash against Fulham at Craven Cottage - just days after making his Premier League debut in the home defeat to Sunderland.
De Ridder, 25, signed for the South Coast club on a three-year deal from Dutch outfit De Graafschap last summer.
However, with firm interest from Holland, Belgium and some Championship sides, De Ridder is hopeful of having talks with the club's hierarchy over his future in the next few days.
He told Belgian magazine Sporza: "I was extremely pleased that I could make my debut, but I wasn't unhappy with my performance so I was very disappointed I was not there on Wednesday against Fulham. I have received good feedback as well, which is strange.
"I believe that I am still on a good path and I have proven that I can deliver something others don't have.
"I was surprised with my non-selection and will ask for an explanation from the coach.
"Of course I am thinking about my future. I am really aware that at a certain point I really have to start playing.
"There is interest from The Netherlands, Belgium and top sides from the Championship in England."