There are plenty of players in the squad who are ready and waiting to replace the 26-year-old should he start to tire and become fatigued in the second half, including Lawrence, Fabio Silva, and Kemar Roofe.
Clement needs players who can change the course of a game with a single move in these kinds of European ties. Cantwell is the only member of Light Blue who routinely produces those moments, but Lawrence and Silva are also capable of them.
Ferguson may be correct, and hopefully the Englishman will be ready to go on Thursday night.