Kome is a former Cameroon teammate of Song's and a close friend.
The former Getafe, Mallorca and Real Valladolid player said: "Alex combines strength with good technique. His best quality is that life is not complicated, always chooses the easy option. I'm happy for him, he will not have trouble adapting to the team.
"One of his best qualities is making assists. He can play midfield but also at centre back."