The 18-year-old Nigerian joined AIK last summer and has played 18 games, scoring five goals.
"From my first day at AIK, I have enjoyed every second, but now another dream has also come true. Even though I am now leaving AIK, I will always carry with me what the club has meant to me and my development, both as a footballer and as a person," Yohanna says in a press release.
AIK states that the net income from player sales is between 130 and 170 million SEK.
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