Iowa State star point guard Tamin Lipsey will be sidelined four to six weeks with a knee injury, the school announced.The two-time All-Big 12 selection sprained his right MCL in practice Tuesday but could return in time for the Cyclones’ Nov. 3 opener against Fairleigh Dickinson.Lipsey averaged 10.6 points, 3.1 assists, 2.6 rebounds and 2.0 steals in 34 starts last season as head coach T.J. Otzelberger’s squad finished 25-10 and reached the second round of the NCAA Tournament.