Mbappe's future has been a talking point for much of last season and this season so far. The France international is in the final year of his PSG contract.
Roma manager, Jose Mourinho, was sent off after storming onto the pitch during his side's pre-season friendly 5-2 defeat to Real Betis on Saturday at Benito Villamarin.
Boateng joined the Italian club from Eintracht Frankfurt in the German Bundesliga after winning DFB-Pokal last season with a 2-0 victory over champions Bayern Munich.
It is believed that Valverde's job was not in immediate danger, following a 3-2 defeat to Atletico Madrid in theSpanish Super Cup semi-final. But Barca changed their minds and sent Abidal and Grau to hold meetings with Xavi.
The former Tottenham ace also claimed three UEFA Super Cups, three Club World Cups and one Spanish Supercopa. Bale returned to action from his latest injury spell on Sunday to net his 99th goal as Real Madrid claimed a 4-2 win at Espanyol.
TheSpanish giants see Mata as good transfer option especially with the possibility of landing him for free. Mata who was a £37.1million signing from Chelsea in 2014 has registered four goals and two assists this season.
Extra-time goals from Marcos Llorente and Alvaro Morata condemned the Reds to a 3-2 defeat on the night and 4-2 on aggregates after the first leg had ended 1-0 in favour of the La Liga side.