Messi said if it was up to him, he would want to stay at Barca, but the situation was complicated.
In the big games, Portugal beat Argentina, England beat Scotland and Germany beat Spain.
Neymar scored twice for Brazil against Turkey and Lionel Messi's penalty earned Argentina a win over Croatia.
Real Madrid beat La Liga leaders Barcelona 3-1 in the 'Clasico' on Saturday.
The goal machines of Bayern Munich, Chelsea and Shakhtar Donetsk cranked into top gear on Tuesday night.
Lionel Messi notched his 250th La Liga goal to move one off the all-time league scoring record.