He have more 5 players than you, if he put his best eleven he will have almost 1 star more than you in each player. If you look better you have 5 players 6* and he have 15 players 6/7*

I'm rookie, but my advise is:

It will be very hard for you. If it was me i try a defencive strategy with lots of midfield players, and try the luck in counter putting your navarro at AML and only one striker. Normal mentality mix pass, hard tackle, try to put him offside and counter.

Good luck