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"We need players all around the pitch, four at least," said the former Leeds boss.
"I have given the board a list of names. They are gettable players, not out of our reach - but it would take expenditure."
Aston Villa assistant manager Roy Aitken reiterated the need to strengthen the squad after a disappointing 2-0 defeat to Crystal Palace.
Villa missed out on primary target James Beattie, and on the evidence of a poor performance, fresh blood is a must this winter.
"It's been that kind of mid-table start to the season," said Aitken.
"Over the course of the game we just couldn't put the ball in the net, the strikers have had a barren spell.
"It's something we have worked on and we believe we have the strikers at the club that can still score goals.
[Missing out on Beattie] is just football. It happens every season at every club and it was up to the player where he wanted to go.
"The manager's on record as saying we want to bring in four or five players - whether that happens over a longer period depends on the funds and players that are available.
"We've said since the start of the season that it is important to strengthen. We're short on numbers and it would be nice to freshen up.
"The players have done great and it's important we push on from here. We are looking for quality players. The manager has given the chairman seven names."