While there is yet to be any public announcement on Gibson's future, Paul Farbrace, England's assistant coach, appeared to inadvertently confirm the appointment after the opening day's play of the final Test against South Africa at Old Trafford.
Live coverage of the fourth Test between England and South Africa continues on Sky Sports Cricket with over-by-over commentary and in-play video clips available on our live blog across digital platforms.
Ali controlled a 58-run stand with Toby Roland-Jones, scoring 45 of those 58 runs from just 40 balls.
Three times Moeen hit Maharaj for six and his confidence, shot selection and execution raised the question of why he is batting down at number eight.
With England 200-7 at Old Trafford, leading by 336 and in the 63rd over of the day, Ali opened up and launched a huge drive over the top of bowler Keshav Maharaj towards the pavilion.
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"I felt like I couldn't bowl badly, certainly this morning", he said. But I'm thrilled by the honour and it's nice to get some wickets. But I just want that last wicket, I don't care who gets it.
Debate raged as to whether South Africa's slips were too tightly packed, but it was academic as far as the grateful Jennings was concerned, given how desperately he needs a score after failing to reach fifty in any of his previous seven innings in the series.
With Russell Domingo's current deal to lead the Proteas running out at the end of the current series against England, the highly-regarded Gibson has emerged as the front-runner to take over.
By that point England's advantage appeared decisive, with Joe Root (49) again to the fore, given the previous highest-successful run chase on the ground is the 294-4 scored by England against New Zealand in 2008.
England's advantage in the final test was built on its 136-run first-innings advantage.
Anderson will return on Sunday one wicket short of his 23rd career five-for, and his first in front of the James Anderson end.