Shortly after coach Jeff Brohm made official what we suspected about David Blough’s injury situation, Purdue’s quarterback delivered his own message. “Thank you for all the love and support over the last few days,” Blough wrote on Twitter. “Learned a lot these past few months! Ready for this challenge! I’ll be back!” Blough will return but probably not until next summer after Brohm revealed Monday the Texas native suffered a dislocated right ankle in Saturday’s 29-10 victory over Illinois at Ross-Ade Stadium. Blough will undergo surgery Tuesday and is expected to be out six months, forcing him to miss spring practice. Brohm now turns to Elijah Sindelar as his full-time starter for the final three regular season games, beginning Saturday at Northwestern. Jared Sparks moves to No. 2 on the depth chart but the redshirt freshman will still play receiver. Freshman Nick Sipe is an option, but only if Sindelar suffers a game-ending or long-term injury. Whether the Boilermakers can generate enough offense to win two of their last three games and become bowl eligible now rests with Sindelar. He’s started four games and brings a strong arm and a different pocket presence compared to Blough. “I think we kind of know what he’s good at and what he likes to do,” Brohm said about Sindelar. “But at the same time, I think we've got to make sure we do what our team does well and that’s where David, with some of the zone read stuff and spreading the field came into play a little bit.” Brohm tabbed Blough as the starter the last two games due to his mobility, giving the Boilermakers another option in the run game. Purdue leaned on its rushing game recently, in part due to the lack development and improvement by the receivers in the passing game.