Strange one but as someone else said, Gana proved to be a good buy after initial doubts so let's wait and see.
Currently we play with three forwards despite each having different roles.
Koné and Valencia are gone. Niasse will be given away or back in the reserves. Barkley and Lukaku are very likely being sold.
That will potentially leave us with:
Mirallas - Lookman / Sandro (?) - Calvert-Lewin / Bolasie (inj) - Niang
That's okay on numbers but missing a central striker because Calvert-Lewin is just a kid and Bolasie is injured.
If we kept Lukaku or signed someone else that forward department wouldn't look bad.
Or even replace Barkley with Sigurdsson.