Warburton takes his Brentford side to the City Ground tonight as he plots a way to beat Stuart Pearce's but he is clearly in admiration of the quality at their disposal.
Assombalonga is Forest's top-scorer, while Mancienne has impressed all watchers with his performances at the heart of their defence and Warburton has joined a growing list of those to give the pair praise.
“They have and an outstanding forward in Assombalonga," he said to Brentford's official site. Mancienne is a Rolls Royce of a centre-half."
Despite this obvious quality Forest possess, they head into tonight's clash low on confidence after eight Championship games without a win. It is a terrible run of form - which has seen them drop from Championship leaders to outside the playoff spaces and they know they will need to get back on track sooner rather than later.
Brentford, by contrast, have made a flying start to the campaign after promotion from League One and have adapted to Championship life very well.
They also head into the game off the back of a win against Forest's arch rivals Derby County and anything other than a top-class performance from Pearce's men is likely to be punished.