Holy Week is a time when the pope would be expected to be front and center of events. But as Francis continues to recover from double pneumonia, observers are on the lookout for surprise appearances.

The Vatican on Thursday opened the most solemn period of Holy Week with a recovering Pope Francis largely on the sidelines, as cardinals were designated to take his place presiding over the most important liturgical services leading up to Easter.

Pope Francis, after a long recovery, might be able to participate in the Holy Week celebrations, although the Vatican has not confirmed this. His health is steadily improving, which raises hopes for his presence at key events.