The 33-year-old Watson was one of four Australian players on the field at the Sydney Cricket Ground when Hughes was felled by a bouncy delivery during a Sheffield Shield game about two weeks ago. The bouncer proved to be so fatal that Hughes' life was cut short at 25.
As per the allocations of seats inside the dressing room, the experienced Watson is occupying the chair of his once younger Australian teammate, who had made South Australia his home.
Hughes, whose name is still mentioned above the locker at Adelaide Oval, is the 13th man for the first Test and his title appeared on the official team sheet submitted this morning.
His Test number 408 is being worn by every Australian players instead of their own, the number placed below the crest on their shirts.
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Pace spearhead Mitchell Johnson had said it was important for the team and Hughes' family that his life was celebrated in appropriate manner.
"I'm very proud to be able to wear that number through this Test. It's all very special.