​Liverpool midfielder James Milner is a doubt for the club's Premier League clash with Crystal Palace due to illness, and could be replaced by Alberto Moreno.

The Englishman has been on fine form for the Reds since being converted into a left-back following coach Jurgen Klopp's dissatisfaction with current full-back option Alberto Moreno, scoring four goals in eight games.

However, Klopp may be forced into a change after the German coach revealed that the former Manchester City midfielder may not be back fit and ready for the their trip to Selhurst Park on Saturday.

Speaking in his press conference ahead of the clash against the eagles, via ​the Metro, Klopp spoke of Milner's situation, suggesting he was hoping that the 30-year-old would be able to return to the starting XI.

"We have a few knocks," said Klopp.

"Millie (James Milner) was ill on Tuesday. Yesterday he did a running session.

"We will see how he is today."

The absence of the makeshift left-back Milner could see a return of Spanish international Alberto Moreno, who has been out of favour under Klopp, and hasn't started a game since their opening day of the season victory away to Arsenal, where the 24-year-old endured a horrid afternoon, conceding a penalty in the process.

Klopp has every right to be concerned about the defensive frailties down the left hand side without the experience of Milner at the helm, as manager Alan Pardew's Palace have been on a good run of form recently, with the likes of wingers Andros Townsend and Wilfried Zaha set to target that area in attack.