Rangers manager Philippe Clement has defended the decision to sign Oscar Cortes as the Colombian winger recovers from injury. The Gers have signed a £4m loan-to-buy deal for Cortes following an initial six-month loan spell from RC Lens which was first signed in January. Only seven games into his Rangers career, Oscar Cortes was struck down by a serious injury at Rugby Park which effectively ended his season. The Colombian, 20, then pulled up on the first-day of this season against Hearts, before picking up yet another injury in a training ground duel. The situation has heaped scrutiny on Range…