Karachi, Aug 25 - Pakistan's premier batsman Mohammad Yousuf Tuesday vowed to silence his critics with a forceful showing in the Champions Trophy in South Africa.

Yousuf, under fire for his below-par showing in the recent one-day series against Sri Lanka, said that he is looking to give his best in the elite tournament starting Sep 22.

Some critics have questioned the selection of Yousuf in the Champions Trophy squad, saying that the seasoned batsman is a poor fielder in limited-overs cricket. Those experts have been calling for Yousuf to limit his international career to Test cricket.

The 34-year-old player, however, said his critics should be aware of the fact that he has been suffering from a shoulder problem for the last few years, adding that the injury has affected his performance as a fielder.

'I always field inside the circle these days because of the shoulder problem. But I'm hoping to get better,' he said.

Yousuf said that he is currently training hard for the Champions Trophy in spite of the holy month of Ramadan.