Whittaker and team-mate
Green's Sevco consortium completed the purchase of the business and assets of
Whittaker said: "It would have been nice to be kept up to date, to have some kind of feedback. I think it has frustrated a lot of the players.
"I had an email last week and that's the only contact that I've had with the club through this hard time.
"The only time we saw Charles was when he came in after the last game of the season and stated that the players had done a great thing in taking the wage cut in trying to take the club forward.
"He said he was ready to take the club forward and he had a good vision for the club and I hope he does that."
The 12 top-flight clubs will meet on 4
The uncertainty surrounding which division the club will play in next season was a motivating factor in Whittaker's decision to look for a move elsewhere.
The fullback said: "It's obviously been a very hard decision for all the players at
"From a football point of view, it's best for me to continue my career elsewhere.
"It doesn't look like the club is going to be playing in the SPL and there is no European football.
"I'm 28, I want to play at the top level as much as I can and it doesn't look like I would have that opportunity here."
Whittaker met with manager Ally McCoist earlier on Sunday and revealed those talks were amicable.
He said: "I spoke with him this morning and we had a very nice conversation.
"He said some nice stuff and wished me all the best and I did the same with him.
"I think he realises the position the players are in and he's grateful for the years that I've been at the club and I was grateful to him."
The defender now hopes fans will bear in mind the decision of players to agree to wage cuts of up to 75 per cent in March to avoid widespread redundancies before accusing him of a lack of loyalty.
He said: "I thought it was important that we expressed the loyalty that was shown to the club through a hard time in the administration, with the 75 per cent cut that we took that we didn't need to do.
"We gave the club the opportunity to try to get the CVA and continue the great history that it's had.
"It didn't turn out the way we wanted it to. The new company has only started and there is no history there for us."
On his own future, Whittaker added: "I have confidence in my ability to get another club and continue with a successful career."
He said: "In most situations, the employees are looking to be transferred and the regulations exist for their benefit.
"But within those regulations, there is provision for employees objecting to a transfer taking place. It is that objection that the players have intimated to Sevco today."
Green has threatened legal action against any player who challenges the move to his newco.
Asked if he expects a lengthy legal battle, Catto added: "We only served the notice on Sevco earlier today and they will have to take time to consult with their lawyers.
"I would expect to receive a response from their solicitors and I will need to consider that before I could give a comment on that.
"What I would say is, on the face of it, the TUPE regulations are fairly clear-cut."
Scottish Premier League