The central defender sustained the injury during the first half of the match and had to be replaced by Paul Dummett.
Lascelles has started all 12 of the club's Premier League fixtures so far this season, scoring once.
Newcastle United can confirm that Magpies captain Jamaal Lascelles will be out until the New Year after suffering a knee injury during Saturday's 2-1 victory over AFC Bournemouth.
The central defender sustained the injury during the first half of the match and had to be replaced by Paul Dummett.
Lascelles has started all 12 of the club's Premier League fixtures so far this season, scoring once.