Lingard has only played twice this season – in the Carabao Cup against Luton and Brighton in September – although he has been an unused substitute in three of the last four games.
It has raised doubts over the 28-year-old's future at United, even though the club have triggered a 12-month contract extension until 2022.
Solskjaer said: "This season is going to be about the squad and rotation and to have the right players playing at the right time.
"We have seen so many injuries and the schedule has been so hectic, I think we have been quite good at rotating. That has been standing us in a good stead.
"Say a Jesse, say players who haven't played as much, now they have got to be ready when they've got the opportunity.
"You see Eric Bailly who has come in and done brilliant. He has had injuries and niggles, but you have to train well. That is the work the coaches are doing on the training pitch and the players are putting in the work as well. When you've got a chance you have to be ready to take it."