Kewullay was born and raised in Fourah Bay, a neighbourhood in Freetown, Sierra Leone to Limba parents.

Conteh first moved to Italy in November 1995, joining Serie A team Atalanta from Swedish side Café Opera.

After a short stint back to FC Café Opera, Conteh then joined Serie B side Chievo Verona in January 1998.

Conteh made his debut in the 2005–06 season on January, after having been ignored by coach Luigi Delneri during all his time in Palermo, and however being reconsidered by substitute Giuseppe Papadopulo, who made him play first in a UEFA Cup match played away against Slavia Prague, in which Conteh scored a goal.

[1] He left AlbinoLeffe in June 2008, as he initially failed to agree for a new contract, but re-joined the team on September as a free agent.