The Spaniard, who has been sent to Sevilla on loan this season, was full of praise for the Brazilian playmaker.
For, after all, the 27-year-old could one day end up back on Merseyside should he impress in Spain.
At the moment, it is another player particularly impressing for the Reds - and Aspas himself hasn't failed to notice.
And no wonder, the Brazilian scored, registered an assist and enjoyed a superb all-round performance.
For once, Aspas seems in tune with the rest of the Kop, as Reds fans have had nothing but praise for Coutinho this summer.
The Brazilian enjoyed a strong showing for Liverpool last term but lacked the consistency to produce his very best form week in week out. Could things be different this term?
Meanwhile, another talent within Brendan Rodgers' squad, Raheem Sterling, also tweeted after the huge victory over Dortmund, looking ahead to next week's Premier League opener against Southampton at the same time.
Good team performance today..good result to end our pre season....looking forward to start off season next week ⚽️— Raheem Sterling (@sterling31) August 10, 2014
How good can Coutinho be this season?