St. John’s flew to Chicago on Monday uncertain if leading scorer D’Angelo Harrison will be able to play Tuesday at DePaul because of a concussion. Harrison was diagnosed after being hit in the head twice during the Red Storm’s 74-67 loss to Villanova Saturday. One came in a collision with JayVaughn Pinkston and another when driving James Bell’s elbow hit him in the nose. Red Storm coach Steve Lavin called it a “minor concussion” but said St. John’s will take a very conservative approach. Harrison, who averages 18.7 points, did not practice Monday but was cleared for air travel. “Test again tomorrow and determine at game-time whether he is suited to play,” Lavin said. “As always we take conservative approach on injuries so there’s less long-term risk. . . They are comfortable with him traveling.” The Johnnies (9-6, 0-3) were dealt perhaps the toughest first three conference games or any Big East team – at Xaveier and Georgetown and home for No. 6 Villanova – and still is looking for its first Big East win. They have beaten perennial Big East also-ran DePaul (9-8, 1-3) eight straight times including the last three at meetings at Allstate Arena. On Saturday the Blue Demons got their first conference win in double-overtime at Butler. “DePaul is the most improved team in the league. I don’t think there’s any doubt about it,” Lavin said. “They took Georgetown to the wire at Georgetown, won at Butler, took Marquette – the projected league champion – to the wire.” It is the first game in a stretch of four that includes three home games – Rrovidence Thursday, Dartmouth Saturday and Seton Hall Jan. 23. “I don’t look at it as a soft part of our schedule. We need to take advantage of three out of four at home,” Lavin said. St. John’s had to play without Harrison last season after his season-ending suspension by Lavin Feb. 28 for poor conduct. The Johnnies lost five of six including their last three Big East games and only contest in the conference tournament. The win was at Saint Joseph’s in the NIT’s first round. This year the Storm is deeper, more seasoned and better prepared to absorb the injury.