TL;DR: Alonso has back pain, will miss FP1, team is assessing whether he will take part to the rest of the week-end or not. In the meantime, Drugovich will stand in.

“In the days following the Belgian Grand Prix, Fernando Alonso has been managing a muscular injury in his back,” read the team’s note.

“As he continues with treatment this morning, he has chosen to sit out of FP1. Felipe Drugovich will drive in FP1 alongside Lance Stroll.

“A decision will then be made on Fernando’s participation in FP2 and the remainder of the weekend in due course.”