user: Question: What was the lowest attendance was the opponent was Chelsea?
Columns: ['Round', 'Date', 'Opponent', 'Venue', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['R3', '8 January 2002', 'Wycombe Wanderers', 'A', '2–2', 9921.0]
SQL:

assistant: SELECT MIN("Attendance") FROM "Table" WHERE "Opponent" = 'Chelsea';