Allardyce said on Friday that Rooney has not requested to leave the Merseyside club but he would be "comfortable" if any player wanted to move on.
"It's a tricky question for me to answer", Allardyce said. If he chooses to go then DC will be getting a good player.
"There is an area we need to improve and that is goals".
Allardyce, his own future at Everton shrouded in doubt, said: "My understanding of the situation is there seems to have been some negotiation somewhere along the line but, in terms of clarity as to whether Wayne is leaving or staying I'll find out later today when Wayne comes in for training".
"Lampard, [Patrick] Vieira. now you have Zlatan [Ibrahimovic], you have Wayne, so I hope he enjoys [it]", Mourinho said.
"You would need at least two players to be at the 15 mark and you need the midfielders and wide players to be in the sevens to 10s".