Wanderers are poised to sign Leicester City defender Matt Mills on a season-long loan deal.
The 25-year-old centre-back has been seeking to quit the King Power Stadium after a high-profile bust-up with Nigel Pearson next season.
It had been expected that the Whites would have to cough up £3million up front to secure his signature – but sources in the Midlands claim the move could be made permanent for half that amount next summer.
Mills will be up against Zat Knight and Tim Ream for a place at the heart of the Wanderers defence, and could also face competition from David Wheater, who is pencilled in for a New Year return.
But the 'try before you buy' deal enables him to kick-start his own career, which has struggled since making a £4m move to Leicester from Reading at the start of last season.
It also lets Coyle get a good look at him in a campaign he hopes will finish with promotion back to the Premier League.
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