Yalcouye moves to Swansea on a season-long loan.
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"He is a player who has got a lot of ability, wonderful energy," said Sheehan.
"We want good players here, the right people, and for him to buy into it and be here - it's a wonderful coup to have him for the season.
"I think he is player who can play as a six, eight or 10 and I think he can play in the sides as well.
"He is a player who is full of energy and has a wonderful intensity to his play, but also he's technically a very good player.
"To add a player like that to the squad, we are absolutely delighted."