Leeds United may be forced to sell Socceroo Harry Kewell to keep fellow Australian Mark Viduka.

Leeds chairman John McKenzie said the club was considering letting Kewell go in a possible exchange-plus-cash deal for Arsenal's Jermaine Pennant.

Kewell has 12 months left with the English Premier League club and Leeds is anxious to sign him on a new deal or sell him before his contract expires and he can leave on a free transfer.

"It would be better to have Jermaine Pennant and some money in rather than finish up with nothing," McKenzie told British newspaper The Guardian.

"Clearly we need some money to spend on additions to the current squad. And Peter (manager Peter Reid) quite fancies young Pennant."

Selling Viduka would generate more money than selling Kewell, but McKenzie said the club "would not sell the striker for STG10 million to STG12 million" (up to $A30m).

Kewell has yet to indicate whether he plans to accept Leeds' most recent pay offer or if he will move to another club, most likely Arsenal or an Italian or Spanish side.

"I need some clarity from Kewell and his agent on that," McKenzie said.

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