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The 36-year-old said he has taken the call after communication from the national coach.
Not yet fully fit, Messi, along with Neymar and fellow new recruits Gianluigi Donnarumma and Sergio Ramos, did not make the match squad.
Ramos left Real last month after failing to reach an agreement to extend his 16-year stay in the Spanish capital.
Ramos has been a free agent after failing to agree a new contract with Real Madrid last month and leaving the club where he had spent the last 16 years and won four Champions League titles and five La Liga crowns.
Ramos, 35, ran down his contract and, according to Spanish newspaper Marca, was unable to agree an extension after Real offered him a one-year deal on a 10 per cent pay cut which he rejected.
The Liverpool talisman went down under a challenge from Ramos inside the first half an hour of the Champions League final and suffered shoulder ligament damage which forced him off the pitch.
Deep in the belly of the tiny 7,083-capacity Ipurua stadium, the Real Madrid captain said his side's attitude had been off, their intensity lacking.
The hard-fought win took Zinedine Zidane's side on to 77 points after 34 games, seven clear of second-placed Barca.
Real, who have not won the title since 2017, lead the table on 74 points, four ahead of Barca with five games left and have a superior head-to-head record over the Catalans.
The win kept Real on La Liga leaders Barcelona's heels with 59 points after 28 games. They are two points behind Barca after the Catalans beat Real Mallorca 4-0 on Saturday.
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