The Scottish athlete turned her focus towards the Portsmouth race days after the IAAF World Championships in Doha, where she broke the Scottish record over 5,000m with 14min 46sec to take 10th place.
McColgan stayed in the Qatar capital to prepare for the Great South Run, under the tutelage of mum Liz McColgan, herself a two-time winner of the race in the 1990s.
Victory next Sunday would see Eilish match the achievement of her mum in only her second-ever 10-mile race.
Denver Hume: Portsmouth's expensive forgotten man and why former Sunderland defender really could be one for the future
'We wanted to show him a bit of love' - Portsmouth-based Spurs fans' terrific gesture to ensure Dane Scarlett feels at home on the south-coast
League One latest: Portsmouth linked duo set for Oxford United and Lincoln moves, Southampton prospect joins Blues rivals as Ipswich land former Blackpool and Derby veteran
'Real driving force... lion-hearted display... classy presence' - Neil Allen's Portsmouth ratings from 3-0 Carabao Cup win at Cardiff
'We’ve got a real problem': Portsmouth boss reveals headache after career first at Cardiff
She said: ‘I’m excited to be racing back in Portsmouth for the Simplyhealth Great South Run.
‘It will be interesting to see what’s in the legs after a long season on the track.
‘Last year it was great to try out a new distance and even better to get the win.
‘With the race marking its 30th year it would make it extra special to go out there and match my mum’s record of winning twice – let’s see what happens.’
McColgan will be competing against Gemma Steel and Aly Dixon in the race, which will be televised live on Channel Five.
Steel warmed up for the Great South Run with a strong run in the recent Bank of Scotland Great Scottish Run 10K race in Glasgow.
A winner in Portsmouth in 2017 with a personal best of 52.42, she will give McColgan a run for her money.
Dixon has also tasted recent success, having broken two world records in the space of eight days.
The Sunderland Stroller romped to the 50KM World Championships title in Romania just a week before running in her home race at the Simplyhealth Great North Run. There she set a new world record for running as a superhero, donning the Wonderwoman costume at the world-famous half marathon.
Famed for its fast and flat seaside course, the Great South Run regularly attracts the world’s leading elite runners as well as the cream of the crop domestically.
Alongside McColgan, Dixon and Steel, the likes of Louise Damen, Rebecca Murray and Verity Ockenden will be pounding the streets of Southsea.
Launched in 1990 in Southampton before moving to its present location 12 months later, the Great South Run will be staged for the 30th time next weekend.
Entries for the anniversary event have sold out, with more than 20,000 runners taking to the start line on Clarence Esplanade across the weekend, with a 5k and junior events also taking place.