Freddy Adu is set to resist interest from England to sign with Portuguese giants Benfica.
Adu was not present for Real Salt Lake's game against the New England Revolution on Saturday night and Kreis acknowledges he does not expect Adu to return to the club.
"This is certainly a scenario that does not surprise us, and we would like to thank Freddy for his time here and wish him the best of luck."
A native of Ghana, the 18-year-old has been previously linked to several of Europe's top clubs, including Chelsea and Real Madrid while he also spent two weeks on trial with Manchester United last year.
Adu has scored one goal and contributed two assists in 11 games this season with Salt Lake, who acquired the midfielder in a trade from D.C in December last year.
Kreis added: "Really, what we know about it is that Freddy has received a fantastic opportunity to go overseas and play, where he has said he wanted to (play) for a while.
"In my opinion, I have to respect that and allow him the opportunity to do that. If we had forced him to play here, there would be a possibly injury, and that whole deal could be scrapped."