The 18-year-old has burst onto the scene in Sweden this season, scoring two goals and providing two assists in his seven games so far.
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According to journalist Florian Plettenberg, Chelsea have now entered the race alongside Brighton for his signature.
Brighton are currently well ahead of the Blues, however, as they already have a ‘verbal agreement’ with Yohanna.
Newcastle are also interested in the young winger and are said to be offering him more money that the other two clubs.