Celtic sent shockwaves across Scottish football in early 2010 when Keane arrived on a short-term deadline day deal from Tottenham Hotspur, while the signing of Swedish international midfielder Ljungberg on a short-term basis later that year was another attempt to boost the box-office appeal of the Parkhead squad.
Players as illustrious as Dimitar Berbatov could be deemed surplus to requirements at Fulham this January, but the Northern Irishman is keen to lay solid foundations and only wants to add players who are prepared to stay on a permanent basis.
"No, I don't want to bring any players like that in because it won't serve any purpose going forward," said Lennon. "Any player we do bring in I would like to be permanent."
As such, the Northern Irishman is still searching for "three or four" new additions to his squad, with striker Holmbert Fridjonsson having already joined from Icelandic side Fram. One of them may or may not be Hiroki Yamada, with Lennon still non-commital about the Japanese international playmaker, who impressed on a week's trial at Lennoxtown recently.
"He's still in the mix," said Lennon, about the Jubilo Iwata player. "We haven't made a decision yet. We don't have to make a decision until the end of the month. He came in and did well, but we haven't said yes or no yet. We are trying to whittle it down to three or four players."
While there will be no unseemly haste to buy players in time for the trip to Turkey in mid-January, and the future of contract rebels Georgios Samaras and Joe Ledley has yet to be resolved, Lennon did indicate that the club would be taking up the option of a further year on the contract of Emilio Izaguirre, one of his most consistent players this year.
Lennon said: "Left-backs are hard to find and we have a really good one there. I've been pleased with the consistency he's shown and he's still at a good age at 25 with the best years in front of him."