"There have been contacts with Martin," Lopez is quoted by Italy's blogf1.it, "but he is not necessarily the only one.
"We have talked to at least three other people."
The report said the Whitmarsh deal could fall over on the issue of his salary, given recent staff cuts at the financially-troubled team.
Meanwhile, after Lopez said recently Lotus has a new sponsor in the form of Russia's Yotaphone, it emerges that the parent company has in fact bought a stake in the Enstone based team.
"This is not a mere sponsorship, we have acquired an equity stake," the spokesman for Yota Devices is quoted as saying.