Matt Le Tissier has urged Southampton boss Ronald Koeman to sign striking reinforcements before the transfer window closes.
Steve McClaren insists he is wiser and more patient for his experience at Nottingham Forest.
And the former England manager has vowed to take his time in his new role of head coach at Derby after admitting he made mistakes both prior to and during his appointment at the City Ground.
McClaren was unveiled as Nigel Clough's successor at a press conference on Tuesday morning having left QPR 24 hours earlier, where he had been working as a coach since the beginning of July, and signed a deal until the summer of 2016.
His return to Derby, where he was a player in the mid-late 1980s and then a decade later assistant to Jim Smith, sees him take charge of a club in England for the first time since his ill-fated spell with the Rams' rivals.
McClaren accepts he made errors at Forest.
The 52-year-old openly says he did not do his research on the owner, the late Nigel Doughty, or the squad he was inheriting before taking the job.
His reign at the Reds lasted just 112 days. Forest amassed eight points from the 10 Championship games he was manager and McClaren resigned on October 2, 2011.
McClaren had been promised money to spend and given assurances about new players but many signings never materialised.
If he went into the City Ground blind, the former Manchester United coach is certainly walking into Pride Park with his eyes wide open.
"Nottingham Forest was a great club with great fans, but I misread the situation and jumped in," said McClaren.
"I didn't have enough information; in terms of expectation, in terms of ambition, in terms of resources, in terms of the people I would be working with and all that kind of thing.
"But that was my mistake, nobody else's, and I hold my hands up for that.
"I went in and tried to change too much, too quick. I didn't really adapt. I think that is important when you come into a place, you need to adapt and the club needs to adapt to you.
"I tried to do too much too soon and change the expectations, probably not external but more internal, and therefore wanting it too quick.
"I rushed things and didn't bide my time and football has a habit of tripping you up if you try to rush things.
"But football, especially nowadays, is very up and down. This is normal in a career, there are a lot of highs and a lot of lows.
"So coming in here, I had a good chat with (chief executive and president) Sam (Rush) on Saturday evening, Sunday and yesterday and I know exactly the situation I am coming into.
"I know what I am coming into in terms of what I have control of, in terms of resources and in terms of what is here already - which is important.
"I also have more knowledge of the Championship now having worked at QPR and Nottingham Forest and having watched it a lot this season, so I know exactly what I am coming into. There are no grey areas."
McClaren will watch tonight's home league game against Ipswich from the stands as academy manager Darren Wassall takes charge of first-team affairs.
He is looking forward to seeing in action the players he has inherited as he continues to assess the club from top to bottom.
"I have two and a half years, I am going to take my time," said McClaren.
"Anything we achieve during my time here, Nigel Clough and his staff must also take credit for because they put down the foundations.
"There are a lot of good things here, a lot of things that I can already see do not need changing. I want to keep what is good and add to it, but that will take time.
"I have spoken with Darren Wassall about the work he does and there are terrific foundations in place at this club, and that work needs to continue.
"There are some great players here and the team plays great football. I like how the team gets the ball down and plays, that is what attracted me to this job - the style of football.
"It is about mixing the old with the new and I will take my time to assess the players here first (before considering any new signings).
"It is a long-term project. At Nottingham Forest I wanted it tomorrow and I was looking at the next six days, here it is about the next six months.
"I think with age you become a bit wiser and, hopefully in my case, a little more patient."