Owen Farrell said on Wednesday he felt "nervous" at telling Saracens he wanted to leave, having been associated with the English Premiership club since he was a teenager.
French side Racing 92 announced last month that former England captain Farrell will join them at the end of the season on a two-year deal.
Moving to Paris will make the flyhalf ineligible for England selection as the Rugby Football Union prevent players at foreign clubs being chosen for international duty.