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Cristiano Ronaldo has warned Juventus teammate Adrian Rabiot to be "careful" of Portugal at this summer's European Championships.
Ronaldo will captain Portugal this summer and become the first player to play in five Euro finals.
The 36-year-old icon could also top the all-time goalscoring charts for the tournament if he scores one goal.
But Ronaldo's dangerous Portugal side, boasting the likes of Ruben Dias, Bruno Fernandes and Diogo Jota, face a tough task after being drawn into the 'group of death'.
France, Germany and Hungary await them in Group F, in what is widely considered the tournament's toughest.
Portugal began warm-up preparations for the tournament with a 0-0 draw against Spain at Atletico Madrid’s Estadio Wanda Metropolitano.
Cristiano Ronaldo will lead Portugal at the Euros
Their final game is at home to Israel on Wednesday before they start their Euros defence against Hungary on June 15.
Despite Portugal again going into the tournament as outsiders, Ronaldo seems confident of his team's chances.
Juventus midfielder Rabiot will come up against Ronaldo in the group stages on June 23 after being included in Didier Deschamps' France squad.
Deschamps' side are pre-tournament favourites after their 2018 World Cup win, with a number of their elite stars in prime form.
Who will win the Euros this summer? Comment below
And Rabiot was asked whether he had been in contact with Ronaldo after his Spain friendly and revealed a brief conversation pre-match.
“We did not speak after that match… We spoke a little before.
"He told me that we had a very strong team because the French national team has been spoken about a lot within Juventus recently.
Cristiano Ronaldo's Juventus future is in doubt
"But he had said to us, “Be careful of us still.”
Meanwhile, Ronaldo's long-term future at Juventus is in doubt this summer, though it is unlikely that a decision will be made until after the tournament finishes.
Ronaldo failed to inspire Juve to domestic glory this season as they missed out on the Italian top flight title for the first time in a decade.
That was despite the brilliance of their Portuguese superstar who claimed the Golden Boot award ahead of Romelu Lukaku with 29 Serie A goals.
But the re-appointment of Massimiliano Allegri and an underwhelming campaign appears to have made Ronaldo contemplate his future with a year left on his current deal in Turin.
According to Goal, Juve have been made aware that Ronaldo is deliberating about his next move.
The report claims Allegri and his staff met for a 'transfer market summit' on Thursday with Ronaldo's future high up on the agenda.
Allegri is said to be keen to resolve the Ronaldo situation as quickly as possible as he looks to shape a side that can return to domestic and European glory next season.