We just found a solution then for him. Invite him the national coach for a few days and then he will hit the market
That's not a solution for your case in point. However, if you search for all your prospects immediately following the draft, there is an option. If you see a team with a prospect that is about to go bot, you can add the prospect to the team. Once the team goes bot, the player will hit the market.
The downside is, it takes a roster spot from your team.
Run of the Mill Canadian Manager