Barcelona made the announcement on Saturday after Messi left in the first half of their 4-2 Spanish league win over Sevilla at Camp Nou Stadium.
Messi was trying to reclaim the ball when he ran into the back of a defender and fell in the 17th minute. Trying to cushion his landing, his right elbow bent badly.
He was in visible pain and treated by team doctors. They wrapped his elbow with bandages and the playmaker tried to continue, but he eventually left the field.