Elanga made it two goals in his last two games with a fine volley to give his side the lead on Wednesday night.
Ole Gunnar Solskjaer said at the weekend: "If he keeps on like he is, I might want to keep him."
He certainly picked up where he left off and the United manager was asked again whether or not the young Swedish striker would be heading out on loan this summer.
“He’s giving me a great problem if you like. As you say, players who score, who have that enthusiasm and energy, we want to play a pressing game.
"If you ask him at half-time to run over to the cricket ground and get us a drink, he’d do it. He’s that type of lad. No frills. He’s been brought through the academy and these are the boys you love to see do well," Solskjaer said.
Solskjaer also admitted he may be left with no choice other than to play the 19-year-old if he continues.
Solskjaer said: "As a manager if they give you reasons to like them or reasons to play them, you have to play them!”
For the majority of his time spent on the pitch, Elanga led the forwards for United. He played as the out and out striker with Mason Greenwood out to his right.
And with Cavani playing the full 90 minutes in the Premier League less than a third of the time, Elanga could become a valuable option to come off the bench.