Virgil van Dijk believes Liverpool players should "stay at home" if they do not have faith that the team can win both the Premier League and Champions League.
Following a 2-0 home triumph against Porto in the Champions League quarter-final first leg on Tuesday, four more matches separate the Reds from a sixth European crown.
With five league games remaining, Jurgen Klopp's team sit top of the Premier League with a two-point lead, although title rivals Manchester City have a game in hand.
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No team has lifted Premier League and Champions League trophies in the same season since Alex Ferguson led Manchester United to domestic and continental glory in 2007-08.