Manzambi, 19, scored two goals and two assists in eleven matches in the Bundesliga last season.
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The central midfielder has managed to score one goal in four international matches for Switzerland.
Now Absolut Fussball reports that Freiburg is at risk of losing Manzambi.
Chelsea are showing interest in the 19-year-old. However, a possible signing could take place via sister club Strasbourg. The idea is that Manzambi will get playing time in Ligue 1, and eventually be transferred to Chelsea.
But German giants Borussia Dortmund have also reportedly caught Manzambi's eye. They were already considering him last summer.