Jackett: Whatmough injury proved costly for Portsmouth
The hosts came from behind to earn a share of the spoils against Grant McCann’s side, with Omar Bogle’s 54th-minute effort cancelling out Mallik Wilks’ first-half opener..
Whatmough felt a twinge in his knee during the first half and was replaced by Christian Burgess almost immediately.
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Hide AdThe substitute and keeper Craig MacGillivray were then caught in two finds, allowing Wilks to open the scoring.
Jackett admitted it was a key moment in the game.
He said: ‘The first 30 minutes I thought we were on top and putting them under a lot of pressure, but the injury to Jack and the substitution sort of cost us.
'The centre-back (Burgess)and the keeper (MacGillivray) got caught in two minds.
‘We should be organised enough but it provided them with a quality goal.
'In the second half again we put a lot of pressure on Doncaster and got a very good goal back from Bogle.’