Lucas Moura expects Leonardo to do right by Paris Saint-Germain amid the uncertainty surrounding the future of Neymar.
Brazil star Neymar is keen to leave Parc des Princes, with a return to Spain via Barcelona or Real Madrid considered his most likely escape route.
Despite the forward s apparent eagerness for a transfer, sporting director Leonardo says they have yet to receive a concrete offer for a player who only joined two years ago for a world-record fee of €222million.
Tottenham forward Lucas left Brazil for PSG in 2013 after Leonardo helped to broker a deal with Sao Paulo for the much-coveted winger.
The 26-year-old has never forgotten Leonardo s impact on his career and believes his return to PSG will be a huge boost to the club, although he does not know what the future will hold for Brazil team-mate Neymar.
It s amazing, he said of Leonardo returning. He is a friend who helped me a lot. He is an incredible person; he is very smart. I am sure he will do good things for the club.
On Neymar, he added: I don t know, it s difficult. He is a great player. I m sure PSG want to keep Neymar. But I don t know what will happen. We will see in the next days.
Lucas was speaking after Tottenham beat Juventus 3-2 in an International Champions Cup meeting in Singapore, in which he scored his side s second goal and set up Harry Kane to net an incredible winner from near the halfway line.
It was a very difficult game, with the heat, he said. But I am very happy. We played very well, we worked very well. It s important to start like that, with a success against a great team. We have to keep going. I m very happy.
Lucas reserved praise for Tanguy Ndombele, who marked his first appearance for the club with an assist for the Brazilian s goal.
He is a great player, Lucas added. He will help us a lot. I am happy for him. He is a young player with a great [football] culture. It s a good thing to have him with us in Tottenham.