Illinois basketball is heading into 2026-27 with plenty of buzz, and the first KenPom preseason numbers back up the hype while also flashing one clear concern: the defense.
Brad Underwood’s team reached the Final Four last season, most of the roster came back, and the Illini are being talked about as a unanimous top-five program to open the year. KenPom’s first rankings have Illinois at No. 4 nationally, behind Duke, Florida and Houston.
The good news for Illinois starts on the offensive end. KenPom has the Illini with a 125.4 offensive rating, which is second-best in the country and trails only Florida. That matches the feeling around this group: there is a lot of firepower here, and there should be plenty of scoring punch again.
The concern is what happens when Illinois has to stop people.
KenPom projects the Illini with a 95.6 defensive rating, good for No. 22 nationally. That stands out among the teams near the top of the rankings, since none of the other top-eight programs are sitting with a defensive mark in the double digits like Illinois.
And honestly, the numbers reflect a real question. Last season, Illinois allowed 68.8 points per game, which ranked No. 45 in the nation. That was with Kylan Boswell on the floor, and he was arguably the team’s best defender.
Now Boswell is gone, which leaves a hole in the backcourt defense. Illinois still has Zvonimir Ivisic coming off the bench, and he gives the Illini rim protection and frontcourt presence along with his brother Tomislav.
The turnover on the roster suggests some defensive regression is likely. EvanMiya.com’s Defensive Bayesian Performance Rating shows the three biggest departures from last season as Keaton Wagler at 2.29, Boswell at 1.88 and Ben Humrichous at 1.80. The top three replacements listed for those spots are Quentin Coleman at 2.05, Lucas Morillo at 1.23 and Stefan Vaaks at 1.06.
That points to a drop-off on that end, though there’s still one unknown that matters: the freshmen. Coleman and Morillo are both newcomers, and they could end up being better defenders than the ratings suggest.
Offensively, though, Illinois looks built to keep the pressure on.
The Illini averaged 83.2 points per game last season and shot 34.5% from three-point range, and there’s every reason to expect a similar style in 2026-27. Illinois loves to fire from deep, and this roster should have the depth to keep that identity intact.
There are some departures that matter on offense, too. Wagler and Humrichous both hit threes at strong clips last season, shooting 39.7% and 36.1%, respectively. Boswell shot 30.7% from long range.
Even so, there are reasons to think Illinois could actually get a boost from the arc. Vaaks arrives after a freshman season in which he averaged 15.8 points per game and shot 35.0% from three.
Coleman had a huge senior year in high school, putting up 23.1 points per game while making 50.0% of his threes. Morillo also brings shooting, after attempting 3.3 threes per game as a senior and connecting at 40.0%.
So yes, the defense could slide a bit. But the offense is good enough to absorb that blow. Underwood may be barking early as the pieces sort themselves out, but this group should settle in quickly.
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