'Messi is the greatest player in history' - Silva says 'you'll never understand' Barca & Argentina star's quality

Brazil and the Albiceleste will meet in Belo Horizonte on Tuesday after both squeaked past their Copa America quarter-final opponents

Thiago Silva labelled Lionel Messi the greatest player of all-time ahead of Brazil's Copa America semi-final showdown against Argentina.

Messi has been criticised after a quieter Copa America campaign, although Argentina are into the last four and face their rivals in Belo Horizonte on Tuesday.

Silva said there was no doubt the Barcelona star, a five-time Ballon d'Or winner, deserved to be considered the best player ever.

"For me, Messi is the greatest player in history, the greatest player I've ever seen," the Paris Saint-Germain defender told a news conference on Saturday.

"But now, it's Brazil and Argentina. We'll leave it to admire him in other games ahead."

Brazil have endured some difficulties as Copa hosts, booed repeatedly by their fans and needing penalties to edge past Paraguay in the quarter-finals, and now they face a Messi-led Argentina side growing in confidence after back-to-back wins.

While Messi has scored just once in four games at the tournament, Silva praised the forward's ability to produce moments of magic.

"Every time we face each other, whether in the national team or in the Champions League, it's very difficult to face him," he said.

"No matter how much you study, you will never understand the quality he has and the difference he can make.

"At certain times, he pulls something else out of the hat that you cannot imagine. That's his difference.

"As a centre-back you have to study all the possibilities. We know he always pulls left, but many times he pulls right."

Brazil had laboured to a goalless draw in Porto Alegre against Paraguay before squeaking past their opponents on penalties, with Manchester City's Gabriel Jesus converting the winning kick.

Argentina's 2-0 win against Venezuela in Rio de Janeiro meant they were the only team in the last eight to score a goal, as they advanced to the semi-finals courtesy of strikes from Giovani Lo Celso and Lautaro Martinez.

The winners will face the victor of the other semi-final between Chile and Peru, with the final set for July 7 at Rio's Maracana.