Tonev has been left out of some of the claret and blues' matchday squads lately and Lambert admits he is "looking for more" from the Bulgarian international.
"You're looking for more from Alex," said Lambert to the Birmingham Mail.
"He's got all the attributes there as well; speed, two feet, everything's there for him.
"He's probably taken longer to adjust with a lot of things.
"But he's got all the attributes there and it's just about trying to get that together and that's why I've put him in and out.
"He's got blistering speed, two great feet and you probably wouldn't know what's his strongest foot actually because of the way he can kick it with both. He's taken long to adjust but you always know that can happen."
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