Memphis scored two of the goals in United’s 3-1 Champions League play-off win over Club Brugge.
“I am happy of course that I scored and we won the game. We created a lot of chances,” he told BT Sport.
“It really important to score the last [third] goal of course but I’m a little disappointed that I didn’t finish the last two chances. It’s a good result and we have to travel to Bruges and finish the job.
“At the end of last season I finished with a lot of goals and to come to a big club you have to score and do the job. It’s a nice feeling to score at Old Trafford
“I am little disappointed because I will think about that last chance.”