At 20 years of age, those whom have worked with Salisu believe the sky's the limit for the centre-half.
Here's what some have to say about Real Valladolid's exciting defensive talent:
VICTOR FERNANDEZ (Valladolid youth coach): "(When I first saw him) it seemed that many things were tactically lacking, but he understood the game easily and very quickly, despite the language.
"Upon arrival, with two training sessions of mine, I saw that it marked a difference. The physique he had, also the inner and outer determination were incredible. Everything that is now happening for him, I imagined would happen."
FRAN CASTANO (African Talent Football Academy director): “I found him very elegant and was also left-sided, which is very difficult in Africa. The technical level was very high.
"I think he will be one of the best central defenders of African football and if everything goes well he could play in one of the 10 best teams in the world."
KIKO OLIVAS (Valladolid defender): "He could improve tactically. He still lacks things but it's normal. You have to gain experience and know, above all, what is the best movement at every moment. Even so, he is playing incredible games and has things quite controlled."
SERGIO GONZALEZ (Valladolid coach): "Last season he was working in the background, he internalised all the work, and now he has a brutal season. Now he has broken the door down. He has been a very consistent on his part.
"The important thing is that he knows how to manage all this. He has a teammate and roommate like Kiko Olivas that helps a lot."
MIGUEL ANGEL GOMEZ (Valladolid sporting director): "Salisu came as a youth. I was at the African academy and we bought him for 50,000 euros. Many teams and foreign clubs come to see him every weekend. He is pure talent.
"It is normal that there are so many people following him because he has a brutal potential. In addition to genetics, he has a high capacity to learn. It's no wonder what is moving around him."
SERGIO GONZALEZ: "We need to help him, push him, correct him, teach and educate him. The rest he does alone on the field, he is smashing the stages, he is an important central defender."