Liverpool boss Jurgen Klopp is wary facing Manchester United striker Rasmus Hojlund on Sunday.
The Dane is expected to be fit for the FA Cup quarterfinal.
Klopp said: "I don't know much about United's season, but I have seen a few good performances from them.
"They have some injury problems, but at the same time also a lot of quality.
"Maybe Rasmus Hjlund is back? Maybe Wan-Bissaka is close? It obviously makes a difference (whether they are ready), but we will wait to see it until Sunday."