Hull boss Sergej Jakirovic felt a virus among the squad was a factor in the 3-0 loss at home to Blackburn, but admitted the visitors deserved their win.
Key defender Charlie Hughes and summer signing Akin Famewo missed the match because they were ill, while others played despite being under the weather.
"A very disappointing day for us. After 20 minutes we had some chances to score and then we made one mistake in our defence which they punished with a goal," Jakirovic told BBC Radio Humberside.
"At half-time we tried to change things and they then punished us with two quick goals.