pbr South Africa's Steven Pienaar is not prepared to let the effects of a gruelling Premier League campaign hamper his World Cup, despite admitting his "legs are tired".br ppbr The midfielder, a key figure for the host nation at the finals, looked a little jaded in his country's 1-1 draw against Mexico in the opening match last Friday.br ppbr He was ultimately withdrawn by coach Carlos Alberto Parreira during the second half of the match at Soccer City.br ppbr Ahead of Bafana Bafana's next assignment against Uruguay on Wednesday, the Everton player said: "I played a lot of games in the last months and my legs are tired.br ppbr "But as long as my mind and my heart are willing, I'll keep pushing myself as hard as I can go.br ppbr "It's a league of high intensity and when you are coming off a tough season, its normal that sometimes the body gives in."br ppbr He added: "For a tournament like the World Cup, you want to give your best and you can't let your body hold you back. You just have to push on."br ppbr South Africa are in Group A for the competition, where all the teams are level on a point each after France and Uruguay drew 0-0 in Cape Town in their opening match.