Borussia Dortmund announces Haaland sidelined again due to 'muscular problems’

Borussia Dortmund’s top-scorer Erling Haaland has been forced to take another break due to what the club says is “muscular problems.”Haaland had to go off in the 63rd minute of Dortmund’s 3-2 win at Hoffenheim on Saturday with what appeared to be a groin injury. Earlier in the game, the 21-year-old Norwegian received treatment for a problem with his right knee before continuing. He underwent medical examinations on Sunday and Monday.
For its part, Borussia Dortmund, which ranks second in the Bundesliga, did not specify the nature of the injury, or even the duration of absence from matches for many considerations, including that Haaland is the most prominent football star in the winter transfer market, and it is not recommended to talk about his injury in light of what the winter transfer markets are witnessing, which has become in her last days. 
The German club said in a press statement that successive medical examinations were conducted for the player, along with x-rays during the past two days, to find out how long Haaland will spend on the medical team.