The trio join Nicolas Anelka, Matej Vydra, Scott Sinclair, Diego Lugano, Lee Camp and Goran Popov as summer signings for the Baggies.
And Clarke hopes the club's new arrivals will give his side some much-needed creativity this season.
"We needed to strengthen in the forward areas and we're very hopeful that Stephane and Victor will fit the bill," Clarke told the club's official website.
"Stephane is quick and direct and can be a match-winner. He has the individual skills that can turn a game.
"He creates chances for others as well as scoring his fair share of goals.
"Along with Morgan, I'm hoping Stephane will add more creativity to the team."
Anichebe arrived at The Hawthorns from Everton after his former club snapped up Romelu Lukaku, who spent last season on loan with West Brom.
Clarke believes Anichebe will give his side a different dimension in the final third of the field.
"Victor is a different kind of striker to what we already have here," he added.
"He is a big, strong, powerful targetman. He is the type of forward we identified that we needed to help us this season."