The Posh Under 21s suffered a 6-0 defeat to a clinical Cardiff City side on Friday night at the Leckwith International Stadium.
The Peterborough United Under 21s were beaten by Cardiff City on Friday night in Professional Development League action with the Bluebirds too strong for a youthful Posh XI.
Sam Gaughran's side were second best on the night as Cardiff took advantage of defensive errors to take all three points with the final three goals coming inside the last quarter of the contest.
Gaughran said: "Cardiff are a good side and they showed it on the night, they were ruthless with their chances and we struggled to get a foothold in the game."
Posh: Smith, Bushell (sub Crozier 62min), Trialist, Freeman, Sudakaran, Christoudias (sub Ndonjang 62min), Abbey, Fox, Simmons (sub Okoli 82min), Sykut, McWilliams-Marcano (sub Mlityalwa 82min). Unused subs: Al Sammour, Joseph.