The Hoops have cruised towards the Clydesdale Bank Premier League title this season but have saved their best performances for Europe, where a successful Champions League campaign ended only last week when they exited at the last-16 stage to Juventus.
Lennon's side have come in for intermittent criticism this season for some sloppy domestic performances, most recently after losing their last two SPL matches to Ross County and Motherwell, even though they remain 15 points ahead of the second-placed Steelmen.
Celtic can reach 86 points but any more slips could see them win the SPL title with the lowest-ever points total, which stands at 84. However, ahead of Saturday's visit of Aberdeen in the SPL, the Parkhead manager was on the front foot.
He said: "Listen, what I need is investment. If I can get £10million to spend on new players in the summer, we will be even better. This club is ripe. We have really talented young players in the team.
"We haven't spent a lot of money, we have made a profit every window, we have cut the wage bill and sometimes when you have that sort of cut-back then the quality is diluted at times and that is what we are seeing at the minute.
"Now if I get the money that other Old Firm managers have had in the last 10-12 years I will easily get 100 points and we will make the last 16 on a regular basis. But am I going to ask Peter (Lawwell, Celtic's chief executive) for £10million or £12million?
"He will ask why, and if I say I want to get to 100 points I will get laughed out the door. If Peter says this is what we have to work with, then fine. I have never once banged his door down saying I want three or four million for that player and that player.
"I have prioritised other games in the last two league games. Against Motherwell I had my eye on the St Mirren (William Hill Scottish Cup) quarter-final which I thought was a huge game for us in the context of the season.
"Obviously the Ross County game was a few days after the last-16 game in Turin. What you will see this weekend is a fresh Celtic team ready to go for the title. We have already improved on last season on the pitch and with the success we have had in Europe we have improved off the pitch, for me that is as important as anything else."