Roque Santa Cruz

I've now realized that everyone on this list is Spanish speaking, so maybe Salah isn't as susceptible to this as I'd initially thought.
Anyway, having sat mainly on the Bayern Munich bench for, incredibly, eight seasons, Roque Santa Cruz finally had the opportunity to be the main man, and boy did he take it. 19 goals from the Paraguayan helped Blackburn to a seventh-place finish, and he won Player of the Month in December, thanks to a hat-trick against Wigan to tie the game from 3-0 down. Blackburn went on to lose 5-3, but you can't really blame him for that.
You can, however, blame him for his poor form the following season. He netted just 4 league goals for Rovers, but would somehow earn himself a move to the recently rich Manchester City, although he would never find his form from that first season again.