On Sunday against Sunderland, the 35-year-old scored the opening goal for Manchester United and reached a personal landmark.
Zlatan Ibrahimovic opened the scoring after half an hour at the Stadium of Light, while Henrikh Mkhitaryan and Marcus Rashford wrapped up a 3-0 win for the visitors.
Everton has now won seven consecutive Premier League home games, all of which Lukaku has scored in.
United are four points behind Manchester City with a game in hand, and they're due to face City later in April-the derby is likely to have a significant impact on which team finishes in the UEFA Champions League places.
"Physically he showed, of course, wonderful conditions and Thursday (against Anderlecht in the Europa League) he will be there again".
"The older you are, the more experienced, the more intelligent and you don't waste energy on things you don't need", Ibrahimovic told Sky Sports. "The Europa League is big for us", he said.
Zlatan Ibrahimovic's 28th goal of the season in all competitions put United ahead and Sunderland's cause became all but impossible after Seb Larsson was sent off close to half-time.
"Normally Sergio plays in the Europa League, and that is next Thursday, so not bad for him at all to have a match before that", Mourinho said.
Moyes' overall thoughts: "I'm disappointed we haven't take anything from the game and I think there was mitigating circumstances for that, but ultimately we're not here to blame referees".
Substitute Rashford added gloss to the scoreline in the 89th minute with his first league goal since September, collecting Ibrahimovic's throughball before drilling low across Pickford from 12 yards, as United inflicted further misery on their former boss.
"We could have played a bit better but maybe we felt that the game was in the pocket". "It is as hard as finishing fourth, but it is the only competition that we can win now, so we have to fight for that". It was vitally important to get those three points, too, after Chelsea, Tottenham Hotspur, Manchester City and Liverpool all secured wins on Saturday.
"A mistake can come, we know that a mistake at Manchester United level we pay for the mistakes but the reality is he is a young player and if his attitude improves like he is improving lately opportunities are always coming".
Sunderland were not helped by an injury to Bryan Oviedo, which cut short the defender's afternoon, while Larsson's contentious straight red card for going over the top of the ball on Herrera ended any realistic chance of a win before the interval.
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