Clarke wants two more forward players before Monday's 11pm transfer deadline.
Chelsea are expected to make winger Moses available on loan, which does appeal to Clarke, even though the ex-Wigan man is also reportedly on the radar of Liverpool, Everton and Southampton, casting major doubt over Albion's chances of landing him.
Clarke said: "(Romelu) Lukaku? I don't think so. I've not spoken to anyone recently about Lukaku but I exchanged text messages with Jose about three or four weeks ago.
"He said Lukaku definitely won't be going out and I think he's right.
"Moses is available to come out and he's a player we would be interested in.
"But I can't say I'm confident in landing him or any player at the moment."
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