LIMA, Feb 7 (Reuters) - Six players suffered burns on the soles of their feet after playing on an artificial pitch in blazing sun, Peruvian first division club Sporting Cristal said on Wednesday.Cristal said Juan Cominges, Jose Mendoza, Miguel Villalta, Carlos Lobaton, Erick Delgado and Gabriel Garcia had been unable to train properly this week following Saturday's game away to Alianza Atletico in the desert town of Piura. 'They have suffered first and second degree burns and blisters,' team doctor Enrique Sanchez told Reuters. 'The temperature on the pitch was easily 43 Celsius. I consider it to be physiologically wrong to submit a footballer...to an activity on such a hot surface.' Uruguayan striker Garcia was the worst affected. 'You can't imagine how much it burns,' he told the newspaper El Comercio. Cristal said they had asked the league to avoid playing daytime matches on artificial pitches. Saturday's match, their first of the new season, kicked off at 1300 local time. Several Peruvian grounds, including the National Stadium in Lima, installed artificial pitches for the World Under-17 championship which the country hosted in 2005. The pitches have been widely criticised by coaches. 'Can you imagine Brazil and Argentina coming here to play and not complaining,' said Alianza Lima coach Gerardo Pelusso. Costa Rica played their home matches in the 2006 World Cup qualifying competition on an artificial pitch.