Newcastle United have been dealt a fresh injury blow following Saturday's 3-0 win over Wolverhampton Wanderers at St James' Park.
The Magpies climbed back up to eighth and leapfrogged Wolves in the table with goals from Alexander Isak, Anthony Gordon and Tino Livramento.
During the match, Kieran Trippier was forced off with a calf issue though the severity of the injury is not clear at thsi stage.
"Kieran felt something in his calf and had to come off the pitch," Howe told The Gazette. "That is a concern for us, although I don’t know how serious it is at this moment."
Next up for The Magpies is a trip to Chelsea on Monday, March 11 (8pm kick-off). While Trippier is a fresh concern for the match, Newcastle have been boosted by the recent returns of Isak, Joe Willock and Elliot Anderson from injuries.
Matt Targett could also be back in contention for the trip to Stamford Bridge after four months out with a hamstring injury.
Speaking ahead of the Wolves match, Howe said: "Matty might need a little more time to be back involved with the squad just due to the fact his injury was a muscle injury. But he is back training with the group."
Chelsea beat Newcastle on penalties in the Carabao Cup quarter-final at Stamford Bridge back in December and currently sit 11th in the table, four points behind The Magpies with a game in hand.
Here is Newcastle United's current injury list and expected return dates...
9. Sandro Tonali (suspended)
Tonali was handed a 10-month ban from football after breaching Italian betting regulations. This suspension will rule the midfielder out of action for the rest of the season, next summer’s European Championship and the opening weeks of next season. Has since been charged by the FA and awaits potential punishment. Expected return: 27/08/24 | Getty Images
10. Sven Botman (knee)
Botman suffered an ACL injury against Manchester City in the FA Cup and has been ruled-out of action for 'six-to-nine' months. He will undergo surgery after suffering a similar injury earlier this season. Expected return: October-December 2024 | Getty Images
11. Jamaal Lascelles (knee)
Suffered a knee injury early on in the 4-3 win over West Ham United. Later confirmed to be an ACL issue, ruling him out for a lengthy period. Expected return: October-December 2024 | AFP via Getty Images