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"We can build on recent performances and we have been building since key players came back from the World Cup," he told the Leicester Mercury.
"We are unbeaten since then and I still think we are not where we can get to.
"We had a good win against a good Ulster side, it was hard-fought, and ground out.
"It was great, but I think there's better rugby in us. I don't think we are the finished article yet. There's a lot we can improve on.
"It's difficult for us at the minute because we keep damaging centres and we have a few injuries to the forwards.
"We have not had a first-choice team out, we have been battling along through injuries for quite a while.
"There's no doom and gloom. But I still think we can improve."
Leicester will be looking to build on victories over Aironi and Ulster when they face ASM Clermont Auvergne in back-to-back games later this month.
First up for the Tigers is a trip to Stade Marcel Michelin on Sunday December 11 to face the French side before welcoming them to Welford Road the following weekend.
