Steve McClaren wants to improve Newcastle United's defence in the January transfer window, according to reports.
The Magpies have already been looking ahead to the transfer window, with their start to the season exposing an alarming lack of quality and depth.
One of the key areas Steve McClaren reportedly wants to improve is his defence, and he sees Matip and Knoche as two players who could bring important attributes to St. James' Park.
Matip is playing for Schalke at the moment, and his combative performances have impressed - with his physical strength making him an ideal addition for the Premier League. He also has three goals to his name so far this season, showing his value in the final third.
Knoche, meanwhile, is yet to play for Wolfsburg this campaign, but the 23-year-old is still highly valued by the German giants.
His availability is said to depend on whether Wolfsburg make it through to the Champions League knockout stage, with the player apparently reluctant to depart the club if they are still in the competition.
Newcastle have conceded nine times across their first six Premier League games, and their porous defence has left them in 19th place in the table.