CREATE TABLE table_52463 ("Week" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Kickoff [a ]" TEXT, "Game site" TEXT, "Attendance" TEXT, "Record" TEXT)

Which week was the game against the San Diego Chargers?
SELECT "Week" FROM table_52463 WHERE "Opponent" = 'san diego chargers'
SELECT "Week" FROM "table_52463" WHERE "Opponent" = 'san diego chargers'