Alonso is not unwilling to bring in the most prominent players in his squad, but he prefers a different approach by utilizing the quality of players evenly in every line to produce compact cooperation and build a relationship of mutual need for each other. Dependence on certain players will disrupt the stability of the team, other players will find it difficult to develop because they have to serve respected players.
Alonso is keen to retain the players who were successful last season and add some new faces as he looks to improve his squad after qualifying for the Champions League. Teamwork must always be maintained as it was done last season, the defeat to Leipzig must be overcome immediately so that the same incident does not happen again in a crucial game.
Exactly my point, bringing in a celebrity player there would give the indigenous players kind of low morale and inferiority complex might set in, thereby promoting the players to start competing for recognition among themselves rather than cooperating and delivering results as a team.
Personally I believe that with more training and motivation, the Leverkusen team would still deliver like last season and by the end of this season, the players would've developed more confidence to incorporate a new player of any worth. Bringing in a player it's good to be done during preseason in such a team of young players to enable them blend in before season sets in properly.