Middlesex and Somerset enter their LV= County Championship clash at Lord's, starting on Wednesday 27 August, with the result holding significance at both ends of the table.
The hosts' defeat to Derbyshire last week was a severe dent in a title challenge which had been reignited by a win over Sussex in their previous match.
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The Panthers remain in third place in the table, but are a significant distance behind runaway leaders Yorkshire and know that victory in at least three of their remaining four fixtures is vital if they're to push for a first title since 1993.
Second-place Durham sit 7.5 points clear of Middlesex with a game in hand.
Middlesex do have captain Chris Rogers back in the squad after an absence of two months during the Ashes series - with Adam Voges' spell with the county now over.
It means that club captain Neil Dexter returns to the ranks, while Joe Denly should slip down the order to number three - allowing Rogers to continue his prolific partnership with the division's second leading run-scorer Sam Robson.
Middlesex's defeat in Derby had the dual effect of pushing Somerset into the relegation zone, with just four matches remaining to salvage the season for last year's runners-up.
They have been buoyed by the news that Nick Compton has signed a new three-year deal to stay in Taunton.
The opener - controversially dropped by England ahead of the Ashes series - is auditioning for a spot on the plane to Australia this winter as the reserve opener.
Others involved who will have winter representative honours in their minds include James Harris, Toby Roland-Jones and Robson.