German media accused Bayern of having made panic acquisitions while under time pressure to find suitable deals.
"We are in a very strange situation, after a lot of months without much tennis, especially for me, that I didn't play in America, I don't know if it's a positive thing or a negative thing," Nadal said when asked how important it was to keep the early-round matches short and sweet.
Barca issued a communique shortly after the final whistle confirming Alba had "problems in his right hamstring," adding that he would undergo tests on Monday to discover the full extent of the injury.
"I think I played a really good match. I was very aggressive. I knew from last year I had to change something, so I really wanted to be better than last year and definitely, I was today," said the world No. 2.
"I got a bit emotional last two points of my match. I really started to think still about the match because in tennis we really never know when it's the end. But my memories, happy memories, when I made my comeback here in 2017, when I step on the Philippe Chatrier, I couldn't really imagine me to be in the quarterfinal of this slam. Everything just came back to me," said Kvitova, who was attacked by a break-in knife-wielding robber at her home in the Czech Republic during the off-season of 2016 which left her dominant left hand seriously injured. It was at Roland Garros that the two-time Grand Slam champion made her comeback.
Lo Celso did not train with his Albiceleste teammates on Monday after failing to recover from the muscle strain that kept him out of Tottenham's 6-1 victory at Manchester United on Sunday.
Houssem Aouar converted a penalty in the 28th minute to equalize for the hosts after Melvin Bard was taken down by Alvaro Gonzalez.
In men's competitions, top seed and world No.1 Novak Djokovic only dropped five games to cruise past lucky loser Daniel Elahi Galan of Colombia 6-0, 6-3, 6-2 to reach the last 16.
The game went into turmoil after that as Ciro Immobile was sent off in the 69th minute for slapping Arturo Vidal after being tripped by the Chilean, while Inter's midfielder Stefano Sensi also saw red in the dying minutes.
After four games of the season, Athletic Club Bilbao coach Gaizka Garitano has emerged as the early favorite in the 'sack race' after his side lost 1-0 at home to nine-man Cadiz, before being beaten by the same score away to Alaves on Sunday.
As expected, head coach Gustavo Alfaro included Fenerbahce forward Enner Valencia and teenage Sporting Lisbon winger Gonzalo Plata in his 30-man squad.