The incident occurred hours after Wisdom had featured for Derby on Saturday in a 2-1 victory over Championship rivals Reading.
He is understood to be in a stable condition in the hospital and expected to make a full recovery. A Derby County statement said: “Andre Wisdom has been the victim of an unprovoked assault and robbery.
“He sustained injuries which resulted in him being admitted to hospital.” Merseyside police are investigating the attack.
It is hoped Wisdom will be released from hospital later this week but it is unclear when he will be able to return to action.
A source told The Sun: “It’s awful news. He must have been on a high after his team played so well.
“All his fans wish him a speedy recovery and hopefully he’ll be back on the pitch again soon.”
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He signed on a permanent deal with Derby in 2017 and has made 20 appearances for the Rams this season as they sit three points outside the Championship play-off places.