The Yorkshireman’s appointment will be rubber-stamped by ECB bosses with all formalities completed before the weekend.
But the governing body believe Root’s promotion should have a stage free from other distractions and are leaning towards one of those two days.
Joe Root will be named England's new Test captain next week
Alastair Cook stepped down as England Test captain last week
Indian cricketer Mohit Ahlawat, meanwhile, hit a record-breaking 72-ball triple century in a local Twenty20 match in Delhi on Tuesday.
And the 21-year-old, who has tried and failed in his attempts to forge a first class career, is hoping it wins him an IPL gig with Delhi.
England's top 10 overseas Test victories
Wed, December 30, 2015
Express Sport takes a look at England's 10 best overseas Test victories
Patrick Eagar via Getty Images
1 of 10
England headed to Sydney with the 2010-11 Ashes in the bag but a series win was at stake. Hundreds from Alastair Cook, Ian Bell and Matt Prior set up a total of 644 before the seamers forced the tourists to an innings win
Ahlawat was batting for a local league team Maavi XI in Delhi and smashed 39 sixes including five off the final over, as he posted a round 300.
Get Quotes on Home Insurance
The previous highest non professional innings was 277 off 72 balls by Sri Lankan Dhanuka Pathirana in a Saddleworth League competition in 2007.