LONDON-England wicketkeeper-batsman Matt Prior is in doubt for the Test series against Sri Lanka starting June 12 after it was announced that he will not travel to Lancashire for Sussex's County Championship match starting Sunday because of a persistent achilles injury . Prior was dropped during the disastrous Ashes tour of Australia after making 107 runs in six innings and replaced behind the stumps by Jonny Bairstow for the fourth Test, and his chances of a recall have been further set back.–Agencies