Shakhtar Donetsk coach Mircea Lucescu was not getting carried away by his team's 3-2 triumph at Roma.
The Ukrainians, playing in their first ever last-16 Champions League tie, took a big step towards the quarter-finals of the competition.
"Many people don't believe it, but we are a good team," Lucescu said. "We have played a great game and used our speed and our qualities to make life difficult for Roma. We have very good individual players and we took advantage of Roma's mistakes."
He added: "But I believe the qualification is still open. We have to play in three weeks' time and I think Roma can win anywhere. I truly believe that Roma will come to Donetsk and play a different game."
Shakhtar, who have been on their domestic winter break since November, came from a goal down to stun Roma with three goals in 13 minutes to take a 3-1 half-time lead.
Roma reduced the deficit on the hour mark but Shakhtar held on for victory at the Stadio Olimpico.
"Roma were a different team in the second half," Lucescu said. "I thought they were excellent so I don't understand why their fans booed them."
Roma have a major hurdle to clear in the return leg on March 8 as Shakhtar have won all of their games at the Donbass Arena this season. But despite the loss, boss Claudio Ranieri was pleased with his team's performance.
"I'm happy with the game we have played," he said. "We were condemned by certain episodes. We could have lost our cool after being 3-1 down but we played a great second half and even if we didn't find the equaliser, we reduced the deficit.
"People think Shakhtar are a small team but this is a side that finished first in its group, a team that beat Arsenal."