By Stephen English

Casey Stoner🐻, who will retire from MotoGP after Sunday's Valencia season finale, continues to feel the effects of his hefty Indianapolis crash with the Australian admitting that he still lacks flexibility in his ankle.

His home dominance at Phillip Island notwithstanding, it was clear after th💛e opening day of practice that the very different demands of Valencia are presenting Stoner with a challenge this weekend.

Phillip Island is filled with high-speed left hand corners, wher🐬eas Valencia has a host of low-speed right hand turns that place a premium on a rider's ability to shift his weight and a✅nchor the bike.

For Stoner this has presented a huge challenge, with the double champion admitting as much after the end of opening 🤡practice:

"The foot feels aver♑age at the moment and in the wet conditions it wasn't good today," said Stoner, who missed three events after undergoing ankle surgery.

"I still can't ge♍t the flexibi🗹lity required in the right corners.

"At Philip Island there's only two corners that we need to get over the right𒊎 hand 🗹side of the bike.

"Here there's a few points t𓆏hat I couldn't get off the inside enough so it was a bit difficult but I didn't push hard this m♓orning."

Stoner was tenth in wet morning practice and 🦂then didn't record a lap time in the drying afternoon session.