"This wasn't a scheduled visit. He reached Yashwant Bhavan at Pandurang Budhkar Marg, which houses the office of RSS Konkan Prant, and met those who were present," the sources said.
An RSS functionary said Shah did not have any scheduled party functions in Mumbai today.
"He was at the RSS office here for around 20-25 minutes and happened to meet the organisation's workers, who were there on way to RSS meet at Coimbatore," the functionary told PTI.
Among those who were present at today's meeting were RSS Sarkaryawah (General Secretary) Bhaiyaji Joshi and Sah-Sarkaryawah (Joint General Secretary) Dr Krishna Gopal, RSS sources said.
Joshi, who has been in Mumbai for the past few days to prepare for the annual 'Pratinidhi Sabha' in Coimbatore, was joined by Dr Krishna Gopal last night.
On arrival at Mumbai airport, Shah was received by Mumbai BJP president Ashish Shelar, who accompanied him to Yashwant Bhawan, a BJP spokesperson said.