"To make such an important decision you need tranquility and a bit of patience".
The Spanish team's coach, Zinedine Zidane, comment on Neymar's injury, saying: "I don't like it when a player hurts himself, I am not happy about the injury".
Brazil fans will also be keeping a close eye on Neymar's fitness, especially after he missed their 2014 World Cup thrashing by Germany with injury.
"It is true that, today, the chances of Neymar being ready [to face Real Madrid] are smaller than they were last Sunday [after the Marseille game]", he said. "Things like this are not decided just like that [snaps fingers]".
The 26-year-old started the game against Marseille, which they won 3-0 with goals from Kylian Mbappe, Edinson Cavani and an own goal from Rolando.More news: Ed Sheeran Debunks Marriage Rumours
It hasn't been made clear when will Neymar return to full fitness.
The club did not offer any timetable for his return, though various reports indicate he could miss somewhere in the range of 3-4 weeks based upon the typical recovery timetable for these types of injuries.
"Neymar is under the care of Paris Saint-Germain", Edu said after a World Cup meeting in the Russian resort of Sochi.
Earlier on Tuesday, AFP spoke to a number of medical experts who all set a downbeat tone. "Whatever he decides, it will be respected because of what he stands for in football, in worldwide level".
"(Playing against Real) could compromise the rest of his season".
"It will all depend on his treatment but what's sure is that he wouldn't be at 100 percent (in eight days)", added Gosp Server.