Doncaster have made forward Dany N'Guessan their sixth summer signing.
Tottenham have confirmed that Romanian defender Vlad Chiriches has completed a move to Napoli.
The 21-year-old Ivorian spent last season on loan with Bastia's Corsican rivals Ajaccio, scoring eight goals in 23 games.
Tallo is Claude Makelele's first signing since the former Chelsea, Real Madrid and France midfielder took over as coach of the club. Makelele led his squad in their first pre-season training session on Thursday.