Should Liverpool fans be worried by Iraola's fitness comments?

On Sunday at Anfield against Monaco, Andoni Iraola was very honest after their 3-2 defeat. Two weeks out from the start of the Premier League campaign, Iraola's verdict was that his side had "work to do" because they could not sustain the level that he wanted for the duration of a game. Iraola said that his side played a good first 30 minutes but "they don't have much more, in terms of the levels required to play like this".