Southampton manager Ronald Koeman has warned new Valencia boss Gary Neville that he might struggle to take charge at the Spanish club.
The former Manchester United and England stalwart was recently given the job with Los Che, and will be in the stands as brother Phil, who is interim manager, takes the reins for Saturday's clash with Barcelona at Mestalla.
But the Saints boss, who won the Copa Del Rey with the club in 2007/08, believes that the former England assistant coach could find life difficult in Spain.
"It's a very difficult place to manage," Koeman said. "When I was there it was extremely complicated, nothing worked. And it is still complicated now.
"It is important to learn the language. Does he speak it? I don't know. He has his brother Phil there but it is not the same if someone has to translate for you. Even so, working with his brother will be special."
Valencia are currently third in the Liga standings, and could catch leaders Barcelona should they win Saturday's clash, before Gary takes over for their Champions League encounter with Olympique Lyonnais.