In the Derby confirmed that Andre "was injured, with the result that he was placed in hospital where he is in stable condition".
He drove to the Toxteth/Wavertree area of Liverpool later that night to pick the relative up, and as he got out of his auto, he was attacked in the street by a man with a knife, who stabbed him a few times, and then robbed him.
Merseyside Police said Wisdom was walking in Beaumont Street in the Toxteth area of the city at about 04:30 BST when he was assaulted.More news: Donald Trump ‘told Theresa May she was spineless’ in private calls
"The guy experienced stab wounds to his buttocks and head through the incident".
He was taken to hospital, where he is still receiving treatment.
Wisdom was attacked in Toxeth while visiting family, having featured for Derby on Saturday in a 2-1 win over Reading.
The club tweeted: "Get well soon, Wis".More news: Mel Brooks Pays Tribute To "Giant" Of Comedy Carl Reiner
"Derby County Football Club can confirm that Andre Wisdom has been the victim of an unprovoked assault and robbery", an official statement read.
The Leeds-born defender started his professional career with Liverpool in 2012, making 22 appearances across all competitions, before signing for Derby in 2017.
"Merseyside Police are investigating and the club will focus its initiatives on supporting Andre and his family".
He had previously been on loan at Pride Park and also had temporary spells at West Brom, Norwich and Red Bull Salzburg.More news: Around the Big 12: What's happening at Kansas State