However, the singer went missing in July 2014 along with one Janet Bandu while on holiday at Ada Estuary with Gan, his brother Bafur and others.
This was after Castro and Miss Janet drowned in an accident after going on a jet ski ride in the Bandu Ada Estuary.
Castro has not been found since his drowning and Gyan reveals that he misses his friend every day despite trying to hide his feelings.
“I met Castro in Italy. He was there for a show in Udine with KK Fosu and while performing, he recognized me in the crowd and invited me on stage to dance.” Veteran striker Dan Kwaku told Yebowah in a YouTube interview as quoted by Ghanasoccernet.
“That’s when we clicked and it was in 2005. After the show, I took his numbers and when he got to Ghana, Castro called me to tell me he was back in the country.”
He added: “I asked him to perform some freestyle, so while he was performing, I was harmonizing, and at that moment he knew I had some musical talent. We went into the studio and made the hit record African Girls.
“I miss him everyday but I don’t show emotions. I always feel his presence around me.”
In Gann’s autobiography, Legendary, he described the lengths he went to in search of Castro when the musician disappeared, including visiting a shrine.
“While we were pondering our next course of action, a man from the town appeared. He said there is an oracle in Ada that can help us find the missing. Gyan wrote in his book.
“He said the oracle was very powerful and could easily handle such matters. Although I was not very superstitious, I thought I should go along as we were in a position to mend.
He further explained: “What else can we do? I was a little afraid of the encounter with the priests so I refused to join them in the temple. I had some cash so I decided to go back to the hotel and collect some cash in case we had to make any payments later.
“I was in a quandary, lost in thought and wondering if maybe this oracle could help. One came back with the news that the consultation would cost Ghc 100 and a bottle of schnapps. I silently wondered if the schnapps were for gods or priests.
The former Sunderland star was initially reluctant to join the rest at the temple, but Castro added that even though he did not believe in voodoo, he was worthy of making such a sacrifice.