UEFA president Aleksander Ceferin believes most European leagues will be able to finish the season.
The German Bundesliga is the first major league to resume following the coronavirus pandemic while plans are afoot for June resumptions in Spain, Italy and England.
France and Holland are the two major leagues who have opted to cancel their seasons.
Barcelona said in a statement: "From Monday 18 May the clubs in La Liga will enter into phase three of training. In this phase training sessions of up to 10 players is allowed as the club have been informed by La Liga.
"The first team players will return to training at the Ciutat Esportiva Joan Gamper on Monday at 9.30am CEST with the option of training in groups.
"The players during the first week of training have worked out individually in sessions of endurance and precision."
