Southampton are confident Jay Rodriguez will commit to a new long-term deal but the player will consider his options.
Wolfsburg director of sport Klaus Allofs says the club are keen to hold on to both Bas Dost and Nicklas Bendtner.
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.