"I really think we need to know that everybody is committed to making this club one of greatest in the world," Cook told Sky Sports News.
"There are no conspiracy theories. We are working hard every day to make this a successful football club.
"We need to draw a line and move on to the future, and that's all I'll say on that subject.
"The decision to seriously look at other managerial options was taken just three weeks ago following the Hull City game on 28th November.
"I think it is important to know that Roberto was only offered the job after the Spurs game.
"We negotiated on Thursday, finalised an agreement on Friday and he was not in the stadium on Saturday as was falsely reported."
"The intention was to tell Mark immediately after the game on Saturday. That would give Roberto and his team a full week to prepare for the next game.
"Regrettably, and despite our best efforts, rumours of discussions with Roberto Mancini became public before the game.
"Once Mark was informed, I informed his coaching staff and the players were then informed. That is why Kolo Toure and Shay Given were asked to attend a meeting after the game.
"There was no player rebellion, the playing and training staff are going about their business today as usual, most professionally led by Roberto and assistant manager Brian Kidd."