Matt Ritchie joined Newcastle from Bournemouth for a reported £12m in 2016a
Newcastle's Matt Ritchie could be out for two months with the ankle injury he suffered in Wednesday's Carabao Cup second-round defeat by Leicester.
The midfielder, 29, suffered ligament in what manager Steve Bruce described as a "horror challenge" by Hamza Choudhury.
"There is ankle ligament damage, bone bruising, cuts," said Bruce.
"Thankfully it's not six months, but it's bad enough when it's the best part of eight weeks."
After the game at St James' Park, which Leicester won on penalties following a 1-1 draw, Bruce said: "These tackles are the ones that damage you.
"Let's hope the young lad learns from it because he's a good player, the kid. But obviously it doesn't help us and Matt in particular."
Ritchie, usually a winger, has operated at left wing-back this season, starting all three of Newcastle's Premier League games.
Jetro Willems, a possible replacement, is doubtful for Saturday's home game against Watford.
Paul Dummett is another option for Bruce, who claimed his first win since taking charge at Tottenham last weekend.
Source: bbc.com