Lionel Messi is in a "good moment" physically and excited for the challenge of trying to help Argentina win the World Cup, according to Jorge Sampaoli.
La Albiceleste are set to face Iceland, Croatia and Nigeria in Group D at the finals in Russia, as they seek to go one better than their loss to Germany in the final in 2014.
Messi was said to have arrived at the previous tournament in Brazil short of full fitness after a difficult season under Gerardo Martino at Barcelona.
But the superstar forward has been in sparkling form as the Blaugrana won LaLiga this term, leaving Sampaoli optimistic upon naming his final 23-man squad on Monday.
"I've talked to Messi and I [found] him very excited about what's coming, physically he's in a good moment," the coach told a news conference.
Messi's fellow forward Sergio Aguero has not played for his club Manchester City since April due to a knee injury, but Sampaoli declared the 29-year-old fully fit.
"He is working normally since last week," the coach said.
"[Gabriel] Mercado is not going to have any kind of [major problems]. We'll see how [Lucas] Biglia arrives [in camp]."
Jorge Sampaoli: "Hay jugadores jóvenes y con mucho potencial. Será importante lo que trasladen los jugadores con experiencia". pic.twitter.com/mjhaUzrE3j— Selección Argentina (@Argentina) May 21, 2018
Argentina struggled in qualifying, and needed a Messi hat-trick in their final match away to Ecuador to secure passage to Russia.
Sampaoli, though, is confident the team can impress at the tournament, and is planning to pick the players who are able to cope with the pressure of carrying the hopes of a nation on the big stage.
"The World Cup has to be faced without fear, with loftiness, with presence, and those who are more convinced of their game will be closer to the starting line-up," he said.
"One understands that these players have characteristics that serve us ... with time and the desire to play, this will be enhanced, I have great hope and, every time I see them train, the dream grows.
"For me, the objective is to enhance individual characteristics to make a great World Cup.
"If we dare to play, we will be a complex opponent for anyone.
"We are obliged to move an entire country, I hope we can do it the way we want."
|Ceferin nominated for second term as UEFA president|
|Marseille have ´moved on´ from Balotelli deal|
|´Crazy´ Cheika his own toughest critic|
|McClaren defiant amid QPR woes|
|Lendl joins Zverev´s coaching staff|
|England captain Hartley ready for return|
|Buttler happy to serve up a century as England dig in at Trent Bridge|
|PSV beat BATE in Champions League thriller, Benfica held at home|
|Mkhitaryan backs Emery´s philosophy at Arsenal|
|Championship Review: Leeds go top, QPR problems mount|
|Ronaldo shares snap of ´Juventus family´|
|Aguero is the Premier League´s best foreign import, says Shearer|
|Real Madrid warned they must pay Rodrigo´s €120m release clause|
|England´s Broad fined for Pant rant|
|India on brink of victory after brilliant Bumrah halts Buttler|
|Serena Williams elevated to 17th seed at US Open|
|Kombouare signs new two-year Guingamp contract|
|Scaloni unclear on Messi´s long-term Argentina plans|
|F1 Raceweek: Gasly and Alonso restore focus at Spa|
|Nouri able to communicate, brother reveals|
|Pjanic extends Juventus contract to 2023|
|Odegaard joins Vitesse in latest loan from Real Madrid|
|Luck ´sort of happy´ with sack from Suggs|
|Manchester United´s Sanchez will ´be back soon´|
|Former Giants star Cruz announces retirement|
|RFU set Cipriani disciplinary date despite RPA complaints|
|Spalletti fined €10,000 for ´gravely offensive´ referee comments|
|IndyCar driver Wickens has spinal surgery after Pocono crash|
|Tiger: No doubt this is one of my best years|
|Vice-captain Tiger trying to remain objective in Ryder Cup conversations|
|Ronaldo won´t win Serie A by himself, warns Allan|
|Moeen sends message to England selectors with double century|
|Brunt calls time on Northern Ireland career|
|Tottenham´s Janssen sidelined after foot surgery|
|Liu Xiang breaks women´s 50m backstroke world record at Asian Games|
|Atletico Madrid winger Vitolo suffers knee ligament damage|
|Leverkusen teen Havertz aiming to emulate idol Ozil|
|Beckham to be honoured with UEFA President´s Award|
|CPS drops Hillsborough charges against Bettison|
|Who can take over from Federer, Nadal & Djokovic? Agassi backs Zverev, Kyrgios|
|´Freak incident´ rules Dragons´ Vaughan out for season|
|Kompany: Different Manchester City must not be complacent|
|Toyota withdraw appeal over Alonso´s Silverstone disqualification|
|Manchester City offload defender Denayer to Lyon|
|RPA want RFU to drop Cipriani charge|
|Cheika still the right man for Australia - Polota-Nau|
|Bolt not giving up on Manchester United dream|
|All Blacks must improve ´average´ set-piece, says Smith|
|Raiola hits back at Scholes following Pogba criticism|
|Indians top Red Sox in series opener|
|Struff stuns Cecchinato, Jarry reaches last 16|
|I´ll prove people wrong - Bolt completes first Mariners training session|
|Former champ Kvitova tops Radwanska, Pliskova ousted|
|Sad if it´s Filipe Luis´ last game for Atletico - Oblak|
|White Sox manager Rick Renteria hospitalised before game|
|Carragher: Van Dijk can become Liverpool legend|
|No timetable for Sale return from shoulder injury|
|This is a partnership - Rodgers on contract negotiations with Packers|
|Eagles QB Wentz unsure he´ll be cleared to play opener|
|Balotelli staying at Nice|
|It wasn´t a penalty, says Hodgson as Palace boss fumes at refereeing decisions|
|Salah can play much better - Klopp demands more from Liverpool star|
|Gasly to Red Bull: Vettel, Verstappen and the drivers who took their Toro Rosso chance|
|Klopp in the dark on Karius future amid links to Besiktas|
|Simeone pleased with draw after rigours of Super Cup|
|Captain Reus saves Dortmund in DFB-Pokal|
|I couldn´t care less - Klopp rejects title challenge talk|
|Ailing Bairstow keen to aid England´s unlikely victory bid at Trent Bridge|
|Redskins secure Peterson signing|
|Manchester City goalkeeper Bravo suffers ruptured Achilles|