Spurs tried to sell the Togo striker during the summer transfer window, only to be scuppered by the player's refusal to leave.
"I think his motivation will be high," Villas-Boas said of Adebayor.
"At the moment we have found extreme comfort in playing one striker rather than two like last season.
"What Ade will give us is that possibility, that link-up play he does so well with somebody else. At the moment we continue to play with one striker. We scored so many goals and we don't suffer, so it looks like the way forward for us.
"All three of them will be in competition for that place."
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