GLEN Kenworthy claims the Knights "disgraced themselves" as they lost to Welsh Premiership leaders Pontypridd in the B&I Cup.
"It was a shocker of a performance and they wanted it a lot more than we did," Kenworthy told drfc.co.uk.
"I think we disgraced ourselves in front of our own fans who pay good money to come and watch us week in, week out.
"I'd like to say sorry for it and we'll do our utmost to get a result in the league next week.
"We've got to have a long hard look at ourselves and it's important we get back to winning ways on Saturday."
Knights led 13-10 at half time thanks to PJ Gidow's try and Tristan Roberts' conversion and penalty double.
But Owen Williams' score in first half injury time gave the visitors the impetus and, despite Andy Wright's 53rd minute touchdown, it was Pontypridd who ran in three second half tries to win their tenth consecutive game in all competitions.
Knights' poor second half display brought back echoes of their dismal defeat to Birmingham in a league and cup double header earlier this month - a result that left boss Lynn Howells fuming.
Doncaster host Plymouth Albion in a crucial Championship clash on Saturday (2.30pm).
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