Chelsea manager confirmed winger Noni Madueke missed the 5-0 win over Morecambe through illness.
The Italian coach previously left the England international for a "technical decision" against Fulham in December.
But he explained there was no such controversy after the comfortable win on Saturday, "It was just because yesterday he didn't finish the session. He was unwell," he explained.
Reece James and Romeo Lavia both returned from hamstring injuries but only managed 45 minutes against the League Two minnows.
Maresca explained that the half-time change was pre-planned, adding: "The idea is to slow build the right condition.