No I do not believe he could have.
Trent says that one must accept as canonical the 73 books of the Bible. The reason there is no canon problem with Orthodox is that they hold all 73 as canonical. The canon is not closed in the sense that books cannot be added. Indeed if overwhelming evidence was discovered to support the addition of some of the books held by Orthodox, there would be nothing stopping the pope or a council from declaring it so.
Trent keeps anyone from subtracting it.
“But if any one receive not, as sacred and canonical, the said books entire with all their parts, as they have been used to be read in the Catholic Church, and as they are contained in the old Latin vulgate edition; and knowingly and deliberately contemn the traditions aforesaid; let him be anathema. Let all, therefore, understand, in what order, and in what manner, the said Synod, after having laid the foundation of the Confession of faith, will proceed, and what testimonies and authorities it will mainly use in confirming dogmas, and in restoring morals in the Church.”
Now since Trent was after Luther, if Luther had properly formed a new rite within the church it is plausible that the deuterocanonicals could have been appendices as a compromise for Luther. Not denied as scripture but held as the little canon which is what the name means anyway.