The 23-year-old South African suffered the injury against BV Vitesse on 11 December and faces at least one month on the sidelines. However Pienaar, who will leave Ajax in the summer, is expected to return for the UEFA Champions League first knockout round first leg against FC Internazionale Milano on 22 February. Ajax currently lie sixth in the Dutch Eredivisie.
©UEFA.com 1998-2016. All rights reserved.