LONDON, March 8 (Reuters) - Evian water's owner Danone , a longtime sponsor of Maria Sharapova, said on Tuesday it was "surprised" by the tennis star failing a drug test and would monitor developments.

Nike, TAG Heuer and Porsche have all suspended their relationships with Sharapova following the revelation on Monday.

"Evian has been a partner of Maria Sharapova for many years, and until now, we have maintained a trustworthy professional relationship," the company said in a statement.

"Evian attaches great importance to health, to integrity, and transparency, and we will follow closely the development of the investigation." (Reporting by Martinne Geller in London; Editing by Alexander Smith)