This is confirmed by the two Allsvenskan football clubs.
"It feels fantastically nice. I'm extremely motivated. This is going to be a lot of fun", he says to Häcken's website.
Leach Holm joined Djurgården before this season. After 22 competitive matches, he's leaving.
"Samuel has been clear and explicit during the summer that he wants to change environment and we have now reached an agreement with Häcken about a transfer", says Djurgården's sports manager Bosse Andersson to the team's website.