Gibbs said Indian batsmen would be put under sustained pressure by South African fast bowlers with short-pitched deliveries and the visitors will have to prepare themselves for that.
"It is about being ready for short stuff because they are going to get a lot of it. They need to work on it for a while, especially in the build-up to this first Test. I can pretty much assure you that the pitch for the Wanderers' Test will be pretty similar to the one rolled out for the first ODI (on December 5)," Gibbs said.
"It is about their mental block and they have three, at most four, day to get out of it."
The Indian batsmen have not played a competitive innings since their dismal surrender at Kingsmead in the second ODI, considering that the third ODI's second innings at Centurion was washed out and not a ball was bowled here in the solitary practice match ahead of Test series.
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Asked about this lack of practice by the Indians ahead the two-match Test series, the cricketer-turned-commentator said jokingly, "I think Duncan Fletcher will make excellent use of the indoor facilities available at Wanderers stadium."
Gibbs advised the young Indian batsmen to curb their aggression in early overs on South African wickets and play their strokes after getting settled down.