In it he paid tribute to the former Strasbourg player, and said the France international deserved his new challenge, which presumably meant playing for a club as high profile as United in the Champions League.
The Kenyan international joined the Saints from Celtic in 2013, and starred alongside Schneiderlin in what was a powerful central midfield combination for Mauricio Pochettino, and then Ronald Koeman.
Wanyama will likely have an even more important role for Southampton next season with the Frenchman departed, even if Koeman is looking into bringing other players into the club.
The former Celtic man has been linked to other clubs himself after impressing in his first two season of Premier League football, with Arsenal being one of the club following the player according to the Mirror.
With Wanyama and Schneiderlin in their midfield, Southampton finished eighth and seventh in the Premier League, their best successive finishes in 20 years.