The couple raise four children together, seven-year-old Leni - whose biological father is the supermodel`s ex-boyfriend Flavio Briatore - Henri, six, Johan, five, and two-year-old Lou and would love to take on the care of another youngster after seeing their friend Sandra Bullock go through the process with her 18-month-old son Louis.
Seal told Closer magazine: "I was really inspired by Sandra Bullock, who we`ve become friends with. She came round with her adopted son and she`s raising a little boy by herself.
"She`s giving him a chance, but he doesn`t know it yet, which is just awesome. We`ve talked about adopting. I`ve no idea where we`d adopt from but I think we will one day - just not yet."
Sealadopted Leni in December 2009 but has previously insisted the legal process hasn`t changed the way he views the little girl he has brought up since she was born.
He said: "Adopting Leni doesn`t make her any more or less my daughter as she always has been. It makes a difference to us only in that I don`t want Leni to be Leni Klum and her siblings called Samuel - that`s just not right. I don`t want her to feel different in any way, shape or form."