Manchester City winger Leroy Sane suffered an ankle injury in 2-0 win over Cardiff City in FA Cup fourth round.
Leroy Sane was forced off after receiving a challenge from Joe Bennett just before half time.
Speaking in post-match conference Man City Boss Pep said Leroy Sane could be out for number of weeks and has called officials to offer player more protection.
“Sane will be out,” Guardiola said. “I don’t know how long for, I am not a doctor. Tomorrow we will see.
“They [officials] have to protect the players.
“Not my players. All players.
“They [refs] are there to protect the players. When there is fault, there is fault, and when it is dangerous, it is dangerous.
“I don’t understand the goal [Bernardo] that we didn’t get, but that is okay. We can accept that.
“But they have to protect the players. They have to do their job.”
FA Cup fifth round draw will take place on 29 January Monday at around 7.20 p.m.