The last time the Blues were in the Europa League was in 2013, when they went on to win it in a dramatic 2-1 final win over Benfica. He had a wonderful match and I'm really happy he could play for 90 minutes.
'He's improving. In the last month he's been great in training, ' he said.
'His potential is very, very high.
And Sarri, who has used the England worldwide sparingly so far this season, hailed the impact of the attacking midfielder. Physically and tactically he is improving.
Alonso was not satisfied with his first-half goal, and the Spaniard was only prevented from netting a second when Boyko somehow tipped his well-struck free kick onto the post and crossbar.
Chelsea confirm their place in the Europa League quarter-finals with a 5-0 victory over Dynamo Kiev in Ukraine on Thursday night.
Giroud's nine goals in a season is also the most by any Chelsea player in Europe since the 2012/13 season, when Spanish striker Fernando Torres reached the same figure across the Champions League and Europa League.
"I think he can become one of the best midfielders, not only in England but in Europe".
"He played very well - better in the second half because we found the spaces and Callum in the spaces is really a very good player", Sarri added. First of all, because it means we are in the final and I am happy with that, ' said Sarri.
"You know very well my relationship with the city, with the people".
'So, for me, it will be very hard to play against them in Naples'.