I agree with Bramwell. In the context of football - as in British football - those sentences are very natural. The only correction I'd make is the use of the numeral '1' as opposed to 'one'. For numbers under 10, we use the words rather than the digit: "After the first half, Arsenal are one goal down." "It's hard to play aggressive football when you're one man down."

Yes, both are completely normal and commonly used.