Liverpool U23 coach Michael Beale blasted Manchester United's tactics for Tuesday's 1-1 draw.
Beale branded United "long ball" after the game.
"I'm frustrated," Beale told the Liverpool Echo. "They changed their system which paid a lot of respect to us. All the chances in the first-half, barring the one they had from long range, fell to us. After going ahead, I expected us to go on and win the game.
"I was disappointed with the goal we conceded early in the second half – that didn't need to happen. But after that we played very well against what was basically the same situation that the first-team faced an Anfield on Monday night.
"United defended in numbers and then when they did have the ball they tended to go long to the big No 9."