Robert Lewandowski has again urged Bayern Munich to invest in the transfer market to remain competitive at the highest level of the game.
Lewandowski, currently on international duty with Poland, had demanded in September that the German champions sign more world-class players in order to compete with the top clubs in Europe, adding that he believed money and success are now more important than loyalty in football.
And the striker has now told Reuters: "We shouldn't delude ourselves. Each club needs to get a top player every two or three years to refresh the team, to bring some new blood, new quality."
Chasing a sixth consecutive Bundesliga title this season, Bayern have turned things around under interim coach Jupp Heynckes following the sacking of Carlo Ancelotti in the aftermath of September's 3-0 Champions League defeat to Paris Saint-Germain.
Under the tutelage of Heynckes, who took charge for a fourth time last month, Bayern have moved four points clear in the Bundesliga on the back of four straight league wins and have also progressed to the knockout stages of the Champions League for a 10th straight season following home and away victories against Celtic.
Bayern have also reached the round of 16 of the DFB Pokal with a penalty shootout win over RB Leipzig.
"At this point we really have a good team, but it is known that players are getting older," Lewandowski added.
"We are succeeding [in replacing them] today because we have a young Josh Kimmich, who is really good at his new position and shows that a young player can be a replacement for such an experienced and wonderful one as Philipp Lahm."
Quizzed about his own future, Lewandowski ruled out a move away, insisting his sole focus is on next year's World Cup.
The Poland captain became the first player ever to score 16 goals in a European World Cup qualifying campaign, finishing as the continent's top scorer.
"The tournament is so important that no one will think about changing club in that time," he said.
Meanwhile, Heynckes has praised the younger generation of German coaching talent coming through at the top. Young coaches such as Thomas Tuchel and Julian Nagelsmann have both been hotly tipped as potential successors to Heynckes at Bayern.
"I said at my presentation as Bayern coach and I stand by this: one of these young German trainers is predestined to coach Bayern," Heynckes said. "Young coaches move with the times and are an inspiration for the league.
"It's great that new young coaches are coming through all the time. In Germany, we have a great deal of young highly talented coaches with a clear concept and their own philosophy. They are innovative and work meticulously on the training pitch."