Yorkshire have added academy seamer Ben Coad to their squad for the LV= County Championship match against Somerset at Taunton.
Coad, 19, has impressed in the second team this summer and replaces Liam Plunkett, who has been ruled out for at least a fortnight with a thigh strain.
Yorkshire are also without Joe Root, Jonny Bairstow and Tim Bresnan due to the trio’s England commitments, while Somerset’s Nick Compton and Jos Buttler are absent for the same reason.
Dean Elgar - signed as cover for Alviro Petersen following the latter's call-up to South Africa's Champions Trophy squad - is set to make his debut for Dave Nosworthy's side, but Alfonso Thomas has picked up a hamstring injury and joins Craig Kieswetter on the sidelines.
The White Rose were forced to settle for a draw when the two teams met at Headingley earlier this month, despite dominating proceedings.
A victory this time round would lift Yorkshire to the top of the LV= County Championship table.
By contrast, Somerset are still seeking their first four-day win of the summer, having been thrashed inside five sessions by Sussex last time out.
Worcestershire play host to Division Two rivals Essex in the other LV= County Championship match starting tomorrow.
Both sides have won two of their first six games to be part of the pack chasing early leaders Northamptonshire, with each of Worcestershire’s victories coming by 10 wickets inside the last fortnight.
In the absence of England pair Alastair Cook and Ravi Bopara, Essex could hand a debut to 22-year-old left-handed batsman Nick Browne, who has been named in a 12-man squad that includes fit-again Tim Phillips.
“It's going to be a fascinating game with Worcestershire,” said Essex head coach Paul Grayson.
“Worcestershire will be full of confidence after winning their last two matches but we've been playing some solid cricket. We want to go on a bit of a run ourselves and create some consistency.”