Lukaku is on a season-long loan at The Hawthorns, but Chelsea do have the option of recalling the Belgium international during the January transfer window.
The teenager has impressed during his time with West Brom and scored his seventh Premier League goal of the campaign in the New Year's Day home defeat by Fulham.
Clarke is trying not to think about the prospect of Lukaku heading back to Stamford Bridge and wants to retain the squad he started the season with.
"We haven't had any dialogue with Chelsea about Romelu," Clarke told Sky Sports after the 2-1 loss to Fulham.
"There is a period in January where they can recall him. Like I said before, we can't affect it, so I prefer not to talk about it.
"I've said all along that the squad I started the season with, I wanted to keep for the whole season.
"Rom is a part of that squad and, if we can keep him here, that would be great."