That is according to ESPN reporter Mark Ogden, who claims that the Chile international is still a quality player despite his poor form for the club.
Belgium international Lukaku has been linked with a move to Inter Milan this summer, with new boss Antonio Conte, a fan of his, looking to shape his team.
Manchester United boss Ole Gunnar Solskjaer is himself in the midst of a huge rebuilding job at Old Trafford, but his priority is to bring in players to fill other areas.
Aaron Wan-Bissaka has already joined for £50m from Crystal Palace to fill the right-back void and Leicester centre-half could follow after telling the Foxes he wants to leave.
With money being spent elsewhere, Solskjaer was not planning on bringing any any new strikers, even if Lukaku were to leave.
But Ogden reckons that this could be a chance for Sanchez to shine.
The 30-year-old has scored just five goals in 45 appearances for United since moving from Arsenal last January.
While he has struggled with injury throughout his Old Trafford career, the form shown has been nowhere near what Arsenal fans were used to seeing.
“I think that Sanchez is worth persevering with”
“Well [selling Lukaku is] a gamble in a sense that yeah you’re losing a proven goalscorer,” Ogden told ESPN FC.
“But last season he didn’t score enough goals for United so he didn’t perform to what the expectations were.
“I think that Sanchez is worth persevering with [as Lukaku’s replacement].
“He’s had 18 months at United, when he came he didn’t fit in straight away, fell out with [Jose] Mourinho, came back injured, he’s not really had a run at it.
“People say ‘well Sanchez had enough chances’ but I think Sanchez is one of those players that’s got true quality and I think if you can give Sanchez some love, just tell him you’re going to give him a chance, he will deliver much more than Romelu Lukaku.
“I think Lukaku’s been found out, I think Sanchez has also been found out in the sense that he’s been found out as a top-quality player, he’s just had a bad time. I don’t think Lukaku is top quality.
“So ideally they’d sign another striker but United have so many problems all over the pitch that I think the key at the minute is to get the midfield stronger and the defence.
“Without a strong defence and strong midfield the strikers could score three goals a game and still aren’t going to win the game.”