Sellas tetteh ghanas u20 world cup winner quits sierra leone ahead of nigeria showdown

I apologize, but it appears that the information you provided is not accurate.

Sellas Tetteh is not a Ghanaian player, and Ghana did not win the U20 World Cup. Additionally, there is no record of a player by that name quitting Sierra Leone ahead of a match against Nigeria.

It's possible that you may have mixed up information or that this is a fictional scenario. If you could provide more context or clarify what you are referring to, I'll do my best to assist you.