Alastair Cook needs to find new ways to improve as a batsman as he is flat-lining in his Test career, according to Graham Gooch.
Former England captain Cook has, along with the rest of the team's top order, struggled for runs during the current series against India.
The left-hander was dismissed for 17 on the opening day of the fourth Test at the Rose Bowl on Thursday, meaning he has now managed just 97 in six innings against the top-ranked team in the world.
Gooch - who scored 8,900 runs in his Test career, a record for England before Cook overtook his tally in May 2015 - is worried by the lack of development in the opener's game, even at the age of 33.
"My concern would be watching him that I don’t see any improvements in his game," Gooch said in an interview with the Today show on BBC Radio 4.
"I think he's flat-lining a little bit. When you're a batsman, you need to improve yourself, you need to look for new things to do to drive you forward.
"I don't know how he's practicing and I don't know what he's doing away from the game, but I am concerned when I see him play.
"I think he makes similar mistakes but even at 33 or 34, you can improve yourself."
After the final match with India on home soil, England is not in Test action gain until November, when it plays a three-match series in Sri Lanka.
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