Gary Neville sat out England's training session on Thursday morning after being told to rest his hamstring injury.
The Manchester United right-back was withdrawn at half-time of Wednesday's 3-1 friendly victory against Hungary after complaining that his hamstring felt tight.
Neville is keen to win his 80th cap in England's final World Cup warm-up game against Jamaica at Old Trafford on Saturday, but Sven-Goran Eriksson may decide against risking him in the friendly.
The ultra-consistent 31-year-old is the only specialist right-back in England's squad for Germany 2006 and Eriksson cannot afford for him to aggravate the injury and be ruled out of the finals, as his usual understudy Luke Young had to withdraw from the standby list because of an ankle injury.
Should he decide against using Neville at the weekend, Eriksson will have to choose between Liverpool central defender Jamie Carragher and Bayern Munich utility man Owen Hargreaves to occupy the right-back spot.