Sunderland's move for David Ngog is stalling.

The Daily Express says Sunderland's interest in Liverpool striker Ngog is in doubt as they struggle to match the player's wages.

Ngog is due a pay hike to £40,000-a-week this summer because of a clause in his contract when he signed from PSG in 2008.

But Sunderland are reluctant to match those terms.

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