The player will be presented to press and fans Tuesday at noon on the Camp Nou pitch, the club revealed.
FC Barcelona on Monday announced that its France forward Ousmane Dembele has been diagnosed with a sprained left ankle that would sideline him for about 15 days.
After the 55-year-old's sacking, Ole Gunnar Solskjaer joined United Man Utd as caretaker manager.
Barcelona overturned a first leg defeat to beat Levante in the Copa del Rey but could yet be thrown out of the competition after being accused of fielding an ineligible player.
“Cristiano is an example to follow in training and in his daily life, you can learn a lot from him.”
Messi also discussed Monday's Champions League draw, which pitted Barca against Lyon in the round of 16.
Real Betis eased to a 3-1 win at Espanyol to move into fifth place after a third successive league victory.
Lionel Messi stole the show with two free-kick goals in a blistering display as Barcelona maintained their lead at the top of La Liga with a thumping 4-0 derby win over Catalan rivals Espanyol.
Barcelona coach Ernesto Valverde has said he respected the decision of French defender Samuel Umtiti not to undergo surgery to fix his injured left knee, adding that he hoped the player could return to the field before the end of the year.
Barcelona defender Gerard Pique on Monday accepted paying a fine of 48,000 euros ($54,576) for driving a vehicle without a valid license.
