South Africa skipper AB de Villiers, who is nursing a hamstring injury, will undergo a fitness test ahead of the team’s penultimate ICC Champions Trophy group clash against India The Oval on Sunday.The 33-year-old sustained the injury during his South Africa’s 19-run defeat against Pakistan at the Edgbaston Cricket Ground on Wednesday.He was seen clutching his hamstring while fielding in the second innings of the match and subsequently had to walk off to get some treatment. However, he was back on the field, marshalling his resources, soon enough.Cricket South Africa (CSA) confirmed De Villiers would have to undergo a fitness test on Saturday to determine his availability for the India clash.De Villiers has had a horrid time with the bat, making 4 (vs Sri Lanka) and and bagging the first golden duck of his career (vs Pakistan).In case De Villiers is ruled out of the match, Faf du Plessis will in all likelihood take over the reins. Farhaan Behardien could be called in to the XI to replace De Villiers.Group B which has defending champions India, South Africa, Pakistan and Sri Lanka is still wide open and any of the two teams could make it to the last-four.India and South Africa were hot favourites to go through from the group but Pakistan’s upset win over the Proteas and Sri Lanka’s stunning run chase against India has opened up different possibilities.The India-South Africa game is a must-win for both teams. The winner goes through to the semi-finals and the loser goes back home. The winner of the Pakistan-Sri Lanka game on Monday will also make it to the semis.advertisementWith all the four teams of Group B tied on two points each, Sunday’s encounter between India and South Africa is effectively a quarter-final, with the winner of the match making it to the semi-finals while the loser will be heading home.