The Morecambe visit in the third round of the FA Cup on Saturday.
James has not figured since the 1-1 draw with Arsenal in early November due to a hamstring injury and has made just four appearances across all competitions so far this season.
has said he will take a careful approach to his comeback after suffering a multitude of injuries over the past three years.
Lavia, on the other hand, has missed the last five league games due to a hamstring issue. The Belgium international has establish himself as a vital part of Maresca's team this season, and his non-availability is being cited as a major reason for Chelsea's current slump, having now gone four games without a victory.
"They are both available and can play some minutes," Maresca confirmed at his pre-match press conference on Friday.
At the beginning of the month.
The teenage centre-back, who signed with Boca last summer, was then sent back to the Argentine team to continue his development before being brought to Cobham in an effort to speed up his adjustment to English football.
“Time is not right,” Maresca said, when asked if the 19-year-old would be available for Morecambe. “The plan is for him to get back to fitness so that he can get some match time in the near future, but not now.”
"He had some injuries when he played at Boca so it’s absolutely essential for him to get here and become accustomed to the English climate and the English game. From then on, we’ll begin to implement him into the team.”
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