The Union Cycliste Internationale (UCI) confirmed in a press release that the British rider has been notified:
The Union Cycliste Internationale (UCI) confirms that British rider Christopher Froome was notified of an Adverse Analytical Finding (AAF) of Salbutamol in excess of 1000ng/ml (*) in a sample collected during the Vuelta a España on 7 September 2017. The rider was notified of the AAF on 20 September 2017.
The Anti-Doping Database has registered 53 anti-doping rule violations involving salbutamol. In cycling we have registered seven ADRVs involving the prohibited substance. Last case we have registered in cycling occured in 2014.
Track and field has the most ADRVs involving this substance with 13 registered incidents.