A preliminary vote tally shows that Icahn nominee Andrew Teno has won enough shareholder support to get on Illumina's board, the sources said.

The sources added that the tally has not been finalised and Illumina shareholders can change their votes until the company's annual shareholder meeting starts on Thursday.

The sources asked not to be identified because the matter is confidential. Icahn and Illumina spokespeople did not immediately respond to requests for comment.

(Reporting by Svea Herbst-Bayliss and Greg Roumeliotis in New York; Editing by Paritosh Bansal)

By Svea Herbst-Bayliss and Greg Roumeliotis