Hibernian have completed the loan signings of three players on transfer deadline day.
Boateng arrives from Arsenal, while Haynes joins from Notts County and Watmore makes the move from Sunderland.
Speaking about Haynes and Watmore, Hibs boss Terry Butcher told Sky Sports News: "Danny is an extremely quick forward, who can play anywhere up front. I've followed his career since he made the breakthrough at my old club, Ipswich Town and he has scored goals wherever he has played.
"Duncan is a quick, direct winger with a good work-rate. He is a young player, who has impressed me with his intelligence on the pitch, eye for goal and quality deliveries into the box."
Hibs are seventh in the Scottish Premiership.