Yadav suffered the injury during Middlesex’s last home Royal London Cup match of the season.
Haris Rauf bagged five wickets on his debut and claimed his last wicket with a beaming yorker to Nathan Gilchrist.
Hasan Ali bagged six wickets in the first innings while giving just 47 runs in his 17 overs
Meanwhile, South African wicketkeeper-batter Heino Kuhn, who was not a part of Kent’s playing XI against Surrey has been given the role of captaincy for the Sussex fixture.
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