Cape Town - Manchester United manager Louis van Gaal said he was "not so pleased" with his side's performance after they scraped a 1-0 win over Aston Villa on Saturday.
Marcus Rashford's first-half goal proved the difference at Old Trafford this weekend as the Red Devils maintained their push for a top-four finish, while also confirming Villa's relegation from the Premier League.
Van Gaal, though, felt his side should have killed the game off early on, and knows they need to finish their chances better if they are to qualify for next season's Champions League in the final five games of the top-flight campaign.
"I was not so pleased with the performance because I think we played too slowly," Van Gaal told Sky Sports.
"I know it is difficult against a defensively organised team like Aston Villa - they were very compact - but then you need quick possession play and the gaps will exist. We could not do that today.
"I was happy with the first goal - an important goal. It was a very good switch by Wayne Rooney and a very good assist from Antonio Valencia. He saw Marcus running to the near post and, at the right time, gave the pass. It was superb.
"But we have to finish much earlier and then the game will be over and Aston Villa would not show the same motivation at the end, because they were still in the race for a draw."