I see in the news that Real Madrid have already agreed on Mbappe's transfer to Real Madrid, but I can't understand whether these are just rumors, or have they already decided everything? Mbappe will receive 35 million euros a year and will be Real Madrid's highest paid player. And it seems that the transition will only be possible in the summer, when his contract with PSG ends. Real Madrid just want this player on their team, I doubt they are too worried about him scoring against them again.
Its not really expensive payment salary if Real Madrid reach agreement deal with Kylian Mbappe and agreed with 35 million euro per season regarding he will be free agent on the next season. I think balance with how much money spent by Real Madrid if sign him during still contract with PSG and need to release above 200 million euro or Real Madrid save much money for signing Mbappe. Depend on Mbappe level and qualities about his payment salary over 35 million euro exactly many teams are waiting for his sign not only Real Madrid but also Liverpool and Manchester United are interested to get his sign.
Arriving Kylian Mbappe will make Madrid completed on all position, have good midfielder and Mbappe will make Madrid more solid on attacking line with Madrid easily to win many trophies next season. Lets hope official announcement with Mbappe agree for joining Real Madrid next season.