The Forest striker, who has scored 15 goals so far this Championship campaign, could miss several weeks with a knee injury but was in good spirits last night after what he revealed was a successful operation.
And the 22-year-old posted the above image to social media with a caption that read:
"Thanks for all the messages, Just want to say surgery was successful... onwards and upwards... Smile for the camera!! God is good! I thank him truly #RoadtoRecovery #NFFC."
Assombalonga's mammoth goal tally means Nottingham Forest will be hard pressed to to find an alternative scorer as prolific as the summer signing.
Life under Dougie Freedman, however, has got off to the perfect start possible. Since Stuart Pearce left the City Ground recently, Freedman has won two games out of a possible two as his successor, leading Nottingham Forest to a convincing 3-0 win over Wigan on Wednesday night.
Assombalonga opened the scoring in that clash, however, and his absence will no doubt be a major worry for the new Forest boss.
The 22-year-old's latest update will please Nottingham Forest staff and fans alike, though, with Assombalonga hopefully making a speedy (as humanly possible) return to fitness.