James Tomkins believes it is imperative that West Ham retain captain Matthew Upson in the January transfer window.
Upson has been linked with a move away from Upton Park this month as the club looks to stay on top of their debt mountain.
The 30-year-old's contract expires at the end of next season and the Londoners are yet to open talks over extending his stay.
With various suitors circling for the England international, team-mate Tomkins is desperate for him to stay.
"Matty is a great captain," said Tomkins. "For me he has been brilliant because I've learned so much from him.
"We work very well together. It's massive that we keep him, but that's out of my hands."