The striker is set to return from a serious knee injury.
Lansbury has not featured since the start of January after suffering ankle ligament damage against QPR in a 1-0 win at the City Ground.
The midfielder is a key member of the Forest team, but the striker has perhaps been more keenly missed.
Lansbury has been speaking about his team-mate this week – telling BBC Nottingham Sport that Assombalonga is looking ready to fire:
“I have been working with him since I got injured. We did our rehab.
“He’s come back and he looks strong. He is going to be a real problem when he is back playing for defenders.
“It is nice to be around people like that when you are injured.”
Assombalonga suffered a hideous knee injury 13 months ago in a game against Wigan Athletic.
This came after the striker, signed from Peterborough in 2014, came out firing in his City Ground career - scoring 15 goals in 32 appearances.
Assombalonga is now back in training and attended Nottingham Forest’s derby game with Derby County prior to the international break. He also scored in an under-21 game earlier this week.
His absence for the past year has been keenly felt, with Forest struggling for goals. So Forest fans will hope to see him hit the back of the net before the end of the season.