Earlier, Ireland’s Andrew Coscoran produced a strong run to qualify for the men’s 1500m final but teenager Nick Griggs missed out.
Coscoran faded after leading his heat on the first lap in Rome but his time of three minutes 38.52 seconds was enough to secure qualification in fifth place.
Norway’s reigning Olympic champion Jakob Ingebrigtsen won the heat ahead of the final, which takes place on Wednesday evening (21:26 BST).
Griggs, 19, was 14th with a time of 3:45.66 in his heat, which was won by Great Britain’s Neil Gourley.
There was disappointment for Irish duo Phil Healy and Louise Shanahan, who missed out on qualification in the women’s 200m and 800m respectively. Healy clocked 23.51 to finish fifth in the 200m heats while Shanahan bowed out of the 800m after finishing sixth in her heat in 2:04.81.
Thomas Barr, who helped Ireland to a historic mixed relay gold medal on Friday, was knocked out of the men’s 400m hurdles semi-finals.
With the top two automatically qualifying, 31-year-old Barr finished third in 49.61, missing out on the final by 0.04 of a second.
Ireland’s 20-year hammer thrower Nicola Tuthill completed her impressive championships by finishing ninth in 69.09m – 1.23 metres outside her personal best – as Italy’s Sara Fantini took gold with 74.18m.