The former Orlando Pirates, SuperSport United and Black Aces player signed a two-year contract with the former Swedish champions.
“Edwin is a player with both good power and technique,” Ljung told the club’s website.
“He is highly qualified and will contribute to the squad. Although he can play in several positions, he is thought of as a central midfielder.”
READ: Gyimah joins Helsingborg on trial – report
Earlier, Helsingborgs confirmed that Gyimah had signed a two-year contract with the club.
“We are pleased to announce that the Ghanaian Edwin Gyimah has signed a two-year contract with Helsingborgs IF,” read a statement on the club’s website.
“Edwin Gyimah has been on trial with the team of HIF and took part in the match against Kristianstad FC earlier in the preseason.
“Now the central midfielder, who can also play in the back line, signed a two-year contract with the club.”
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