Nuggets two-way guard Collin Gillespie suffered a lower left leg fracture earlier this week and underwent surgery Friday night in Philadelphia to repair it, according to a team press release. Gillespie was signed to a contract during the first week of this month after going undrafted. He averaged 15.6 points per game for Villanova last season, shooting 41.5% from three-point range. Gillespie averaged 11.3 PPG, 5.3 RPG, 4.3 APG and 1.5 SPG in four Summer League contests. With Gillespie out indefinitely, the Nuggets may look for another two-way option. They already have 20 players on their camp roster, according to…