Wanderers secured the loan capture of Arsenal's 19-year-old Japanese midfielder Miyaichi yesterday afternoon as the clock ticked down towards the 11pm January transfer deadline.
The Trotters then announced in the early hours that striker Sordell, 20, had signed for them from Watford on a permanent basis for an undisclosed fee - subject to confirmation of registration from the Football Association and Premier League - with the England Under-21 international putting pen to paper on a three-and-a-half-year deal.
Miyaichi, who has joined until the end of the season, had a successful loan spell in Holland with Feyenoord last term shortly after being recruited by the Gunners and returned to make two Carling Cup appearances for the Londoners during the current campaign.
Coyle told Bolton's website: "He's a very talented young player, who is quick and exciting.
"He had a great spell on loan at Feyenoord last season.
"He's a young player with tremendous promise and potential and hopefully at Bolton we can give him a platform on which he can display his qualities."
Miyaichi is ineligible to play against his parent club when they visit Bolton in the league this evening and his Wanderers debut could come in the game at Norwich on Saturday.
He follows his Arsenal team-mate Jack Wilshere in making a temporary move to the Reebok Stadium, the England midfielder - currently sidelined by an ankle problem - having enjoyed an impressive stint with the Trotters in 2010 before going back to cement his place in the Gunners side.
Reacting to the news yesterday, Wilshere wrote on Twitter: "Great move Ryo, all the best mate!"
Sordell has scored 10 goals for Watford this season and 27 in total for the npower Championship outfit since making his senior debut for them in 2009.
His is another acquisition which excites Coyle.
"I am delighted to have brought Marvin to our club, as there were a number of other Premier League clubs tracking him," Coyle said.
"We know that he has great potential and I am really looking forward to working with him."
Wanderers last week confirmed the signing of United States defender Tim Ream from the New York Red Bulls, and Coyle added: "Overall, we're very pleased with all the players we have been able to bring in, as we have strengthened and added real quality signings to our squad."
The Trotters were understood to have had a bid for Middlesbrough's Rhys Williams turned down yesterday and a deal for Crystal Palace's Wilfried Zaha, who Coyle on Monday confirmed he had made an offer for, also failed to materialise.
Meanwhile, Bolton fans will have been pleased to see long-serving forward Kevin Davies stay put despite an approach being made for him by Sunderland.
