West Ham United manager Sam Allardyce has slapped a £20m price tag on defender Winston Reid.

The Hammers boss said that he would rather allow the New Zealand international to leave on a free transfer at the end of the season than sell him for big money in January, as losing him could put their season in jeopardy.

"He isn't going anywhere," Sky Sports News quotes Allardyce as saying. "He is not going anywhere unless someone bids £20m or something like that. There is obviously not a lot I can do about that.

"If somebody flirts around with a measly offer because he is in the last year of his contract, we would make more money by keeping him and finishing where we are in the league than selling him and putting our good season in jeopardy. Because replacing him in January - replacing anybody in January - is a very difficult job indeed."

Reid, who has been linked with Liverpool and Arsenal, is under contract with the Hammers until the end of the season and is yet to commit to a new deal.