Does he have a strong ST?
Do you have strong midfield?

You may want to play actually the same, 4-5-1 (or 4-3-3 which is almost the same formation in terms of shape, in real life). Top Eleven is 85% about ball possession and 4-5-1 gives a lot of that.
I believe you'll probably need to play with fullbacks to mark his wingers (if you believe they are strong), so 4 at defense. put 4 or 5 at midfield to balance possession and maybe 1 amc + your ST.
Otherwise, maybe consider a 3-6-1, with 1 DMC and 1 AMC. This formation will also give you ball possession, DMC theoretically adds extra man when you're defending (so you won't be outnumbered) and if you avoid being attacked down both flanks then you'll have a decent match.
Press only on your own half (there's no point to press full pitch in such a crowded enemy pitch unless you normally play a very attacking formation), with a normal/attacking mentality and short/mixed passes.

Alternatively, 3-5-2 (or 3-4-1-2). The extra attacker is always a threat in a straight 4 defenders line. He'll have to use a DMC if he knows any elementary tactics, or 3 defenders and move his fullbacks a bit forward (to DML/DMR). If so, you can push more with an extra AMC.

Last, consider to use your current formation, as you normally do. I don't think 4-5-1 is in any way "tricky". It's used by weaker sides to outnumber midfield and defend hard and to facilitate on strong midfielders+ a very strong ST to make things happen offensively.

PS keep in mind, you don't play vs formations. You play vs teams. When you play against someone it's not (eg) 4-4-2 diamond vs 4-3-3, it's Team A vs Team B. Look at his players, highlight the strong threats and try to neutralize them. If he has no strong midfield, even if he puts 11 players there he will be still weak. If he has not got a very good ST then don't even bother to think any short of counter; he'll suck.