The former Everton and Netherlands coach refused to answer a question about his relationship with Laporta, simply saying: "I am still here."
The Argentine forward missed two Ligue 1 games with a bruised knee but did not appear to be struggling with the injury on Monday morning.
Messi suffered a knock on his left knee and an MRI scan earlier this week confirmed signs of a bone contusion. He missed PSG's 2-1 victory at Metz on Wednesday.
Messi suffered a knock on his left knee and an MRI scan earlier this week confirmed signs of a bone contusion.
Ronaldo, 36, rejoined United from Juventus in August after 12 years away, while Messi has swapped boyhood club Barcelona to join Paris St Germain.
Making his first start for the French team, the Argentine forward hit the woodwork but was otherwise far from his brilliant best.
Messi's 77th, 78th and 79th goals marked his seventh hat-trick for the national side.
The match at Sao Paulo's Neo Quimica Arena on Sunday was halted when Brazilian health officials ran onto the pitch seven minutes after kick-off.
Messi is fit enough to play in Argentina’s World Cup qualifiers this week in spite of having played less than half an hour this season for his new club.
Ronald Koeman's Barca beat Real Sociedad 4-2 last weekend despite the shock of seeing Messi leave for Paris Saint-Germain.
Kylian Mbappe is "relaxed" and not unsettled despite ongoing speculation about his future, Paris Saint-Germain coach Mauricio Pochettino insisted on Thursday.
Messi, who played in the South American final against Neymar and Brazil, only signed for PSG on Tuesday.
The rules were introduced in 2009 to prevent clubs spending beyond their means and distorting the market.
The free transfer of Lionel Messi to Paris Saint-Germain on Tuesday drove home the financial turmoil that is eroding the power of Spanish football
Messi had shown his frustration with the defeats, retiring after losing the 2016 Copa America to Chile only to return to the international fold a few weeks later.
The teams first met in 1914 and in the years since have established themselves as two of the most storied sides in world soccer.
The city said attendees will be spread throughout the entire stadium this time, instead of concentrated in one section.
The two South American giants meet on Saturday at the Maracana stadium with Argentina’s long drought once again the major topic of conversation.
Laporta has continued to mark a cautiously optimistic tone when asked if he was close to convincing Messi to stay put.
Jorge Mas, the co-owner of Major League Soccer team Inter Miami, said he is confident Lionel Messi will join them if he decides to leave Barcelona.