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If Real Madrid succeeds in strengthen their attack line with a suitable player to be positioned at the number nine to get a perfect striking force then definitely the balance of the team will be such that they will have a very formidable strength across Europe and every other team who will be facing them in any fixture thereafter will need an extra effort to win them.
The rumours about mbappe's deal currently still remains speculative because neither parties are yet to give a public stands on the present or current situation of the deal, this includes the fact that mbappe is yet to give a solid stand on his move to Madrid yet neither has Madrid made it known officially if they will still be continuing with the de or not. The impact of mbappe on Real Madrid as anticipated by everyone can't be overly emphasized as it's obvious and that's why the team did all they could at some point to getting the deal pull through.
Also, with Ancelotti intelligence in the next season Real Madrid will certainly be increasingly difficult for any team to beat. On the other side, Real Madrid will also be the dream team of all coaches, if they get the right striker with number 9. Because their current squad looks impressive, and the performance of the Real Madrid players always solid.
But these rumors were strengthened when Mbappe provide a statement that he wanted to play for Real Madrid next season, but it is still not certain yes whether he is serious or not. Because after all, who know in the future maybe Mbappe still play at PSG next season by extended his contract like last season.