Angry Albion will tell Tottenham to pay up or shut up after rejecting a second bid for Saido Berahino worth a possible £21m.
The Baggies rebuffed Spurs' advances again yesterday as chairman Jeremy Peace maintained his uncompromising stance on the striker's future.
And the structure and size of the London club's bid will not have weakened his resolve.
I understand the London club's bid, while worth a potential £21m, was so installment-driven and littered with add-on clauses it only further aggravated an increasingly tense stand-off between two of the hardest negotiators in English football.
Albion dismissed the offer out of hand as the down-payment was so paltry it would have left the club all-but empty handed in the search for a replacement.
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The Baggies still want at least £25m for the former England Under-21s man including a sizeable chunk of the fee up front. Berahino was again left out of the line-up for last night's Capital One Cup tie with Port Vale with Spurs expected to maintain their pursuit.
But Albion remain adamant they ideally want to keep their prize asset, who had a written transfer request rejected on Monday.
They accept that a huge improvement on Spurs' offer might leave them powerless to resist, as head coach Tony Pulis has acknowledged.
But they will be extremely reluctant to allow a late, beat-the-deadline raid at the start of next week that would leave them with no time to act in the transfer market.
Talks with Manchester United over the signing of Jonny Evans are still progressing well and Albion are hopeful of concluding a deal before the weekend.
And they could still return to Tottenham to resurrect a deal to land centre-back Federico Fazio which stalled last week over personal terms.
They also also pushing hard to sign goalkeeper David Marshall from Cardiff with Ben Foster not due back from injury until at least October.