Kylian Mbappe will be remembered as a PSG legend, having spent seven prolific campaigns there and eventually departing as their all-time top scorer with 256 goals in 308 games.

But his legacy was somewhat tainted by the manner of his departure, the sense among many that for the last half of his time in Paris he was just waiting for the right moment to move to Madrid, the club he had dreamed of representing as a young boy.

PSG were not happy with the way in which Mbappe chose to run down his contract in order to sign for Real in 2024, denying them a transfer fee.

He believes he was sidelined by PSG and made to train with players the club were looking to offload after refusing to agree a new contract.

Mbappe missed a pre-season tour to Japan and the start of the next campaign before eventually being reintegrated into Luis Enrique's squad.

All of that should have been behind Mbappe long ago, given the way his first season at Real has gone on a personal level.

The 26-year-old, a World Cup winner in 2018, scored 43 goals in 56 matches for his new club across all competitions up to the end of the campaign in La Liga, a remarkable tally.

However, Mbappe has endured frustration at the Club World Cup, not featuring at all during the group stage due to a stomach bug which led to him requiring hospital treatment.

- First start? -

In his absence, young forward Gonzalo Garcia has made the step up in impressive fashion, starting all five matches in the United States and scoring four goals.

The last of those was the opener in the 3-2 quarter-final win over Borussia Dortmund at the MetLife Stadium on Saturday, but it was Mbappe who got what was ultimately the deciding goal.

He came off the bench midway through the second half and scored a brilliant, acrobatic overhead kick for Real's third of the afternoon in stoppage time.

"He is still not perfect, not 100 percent, but he is getting better every day," Alonso said of Mbappe after that match.

“Now he will have three days to keep progressing and feeling better ahead of the semi-final.”

It is hard to imagine Mbappe not getting his first start of the tournament against PSG, the club who won the Champions League in the season following his departure after so many years of disappointment in Europe with him in the team.

PSG came to the US fresh from crushing Inter Milan 5-0 in the Champions League final.

They reached the last four with a 2-0 win over Bayern Munich in Atlanta in the last eight -- despite having Willian Pacho and Lucas Hernandez sent off -- and need not fear Real.

"It doesn't matter who we play in the semi-finals. All that matters is that we are there and that we want to get to the final," said Luis Enrique, for whom this is also a special occasion given that he spent five years at Madrid as a player in the 1990s.

Alonso has just taken over as Real coach after an outstanding spell with Bayer Leverkusen and has already displayed great tactical flexibility, flitting between a back four and a three-man central defence at the tournament.

It will be fascinating to see which system he opts for here, and if Mbappe starts as he prepares to play against PSG for the first time since July 2017, when he was still a thrilling teenager at Monaco.