Former Leeds goalkeeper Paul Robinson is worried by the track record of Marcelo Bielsa teams fading as the season goes on, with Leeds now suffering a similar fate.
Leeds started the Championship season in mesmerising form, blowing away the competition with their high octane end-to-end style. They have struggled recently, however, and the tempo of their play has noticeably dropped off.
Many had predicted that this would be the case, feeling that it was not possible to maintain such a frantic style for a long league campaign. This has been a pattern at Bielsa's previous clubs, who often start the season with a bang and finish it with a fizzle.
Speaking on beIN SPORTS, Robinson was worried by the Leeds' recent form, which could scupper their promotion hopes were it to continue.
I wouldn't say they (the wheels) are well and truly off, but it's interesting times. They've only won two out of the last seven games.
They are still top because they won seven prior to that.
But it's a big test for him. If you look at him historically, his teams have always faded towards the end of the season.
Whether it's the way he wants them to play, the fitness levels he asks of his teams. And Leeds certainly seem to be following the pattern.
Leeds also failed to replenish their outfield resources during the January transfer window, with goalkeeper Kiko Casilla their only signing. Bielsa has not won a league title since 1998 during his time in Argentina.
Leeds will be hoping to turn around their form this weekend when they travel to Middlesbrough this weekend, with a win for the home side putting them within four points of an automatic promotion place.
While Bielsa has no doubt been a breath of fresh air in English football this season, it feels as though his biggest test is yet to come.