Peterborough United boss Darren Ferguson accepted that side had been well beaten by Premier League West Brom in their FA Cup third round replay at London Road.
The Posh lost out 2-0 to the Baggies, having failed to perform to the same level as they had in the 1-1 draw between the two sides at The Hawthorns.
Ferguson told the Evening Telegraph: "I knew we would have to at least match, or probably even better, our performance in the first tie to have any chance and we just didn't get close.
"West Brom are a quality side and they killed the game off in the first half, when we were very poor despite a bright start.
"We have to accept that we were second best. I was hoping to reach half-time at 1-0 because they were in total control, but their second goal killed the game.
"We changed our system after the break and did better, but they also looked dangerous on the break, so we can have no complaints.
"It was a disappointing display because we didn't do ourselves justice at all. I don't care that they are Premier League, as I still expected us to give them a game."