Madrid, Aug. 12 -- Atletico Madrid's start to the season has been complicated by a muscle injury to striker Alexander Sorloth, which means he will miss the opening matches of the new campaign.

"Alexander Sorloth has suffered a muscle contracture and will have to work apart from the rest of the squad," informed the Atletico website on Wednesday.

The Norwegian's injury comes at a difficult time, with the future of Argentina international Julian Alvarez still uncertain amid interest from FC Barcelona.

However, even if Alvarez stays, the 26-year-old only returned for preseason training on Monday after taking his permitted three-week holiday following the World Cup final and is unlikely to be fit for Atletico's La Liga opener against Malaga o...