Coyle maintains hope that his will not be the last new face to come through the doors at the Reebok, with a pacey striker still high on his list of priorities.
"I'm always looking to improve and I'm not finished yet," said Coyle. "It's easy to say there will be two or three new signings - but what I can say is that I'll look to add a couple more before the end of the month.
"You can never say definitively that it will happen because as you saw with the Marcos Alonso deal, it can be quite complex.
"We'll do our utmost to improve the squad by the start of the season, and if not, certainly the close of the window."