The striker was signed from Peterborough in 2014 and came out firing at the City Ground - scoring 15 goals in 32 appearances.
But he suffered a serious injury of his earlier in the year. The striker dislocated his knee in a sickening injury against Wigan Athletic last February and has not played since.
He has maintained a fairly low profile during his absence but this week he spoke to BBC Nottingham Sport about his comeback, with a certain fixture coming up.
The BBC asked the striker if he might return for the East Midlands derby with Derby County on the 19th March and Assombalonga remained tight-lipped:
"I just heard a big pop and, I don't know, I just started crying.
"The worst pain ever."
"Oh we'll just have to see. We'll see. Tempting but we'll see."
That would put his injury recover at around 13 months, which was about the initial assessment from the medical staff at the City Ground when he first suffered the injury.
One thing for sure is that Forest would love to see him action before the end of the current campaign, as the idea of a Nelson Oliveira and Britt Assombalonga partnership is certainly an exciting one.