Eight Black Cats feature in midweek internationals.
Phil Bardsley and Steven Fletcher helped Scotland pull off a fine 1-0 victory against Poland in Warsaw on Wednesday evening.
Fletcher played the opening 45 minutes with Bardsley featuring for the final half-hour as Celtic midfielder Scott Brown scored the only goal of the game 13 minutes from time.
The second consecutive 1-0 win for Gordon Strachan’s side continues the good progress being made by the Tartan Army as they prepare for Euro 2016 qualification which begins in September.
Elsewhere, Ki Sung-Yueng played 86 minutes as South Korea stepped up their 2014 World Cup preparations with a 2-0 win over Greece in Athens.
Park Chu-Young and Son Heung-Min scored the goals for Ki’s side, who face a tough test in Rio having been drawn alongside Russia, Belgium and Algeria.
Meanwhile, Emanuele Giaccherini played the final 30 minutes as Italy suffered a narrow defeat to Spain in the Santiago Bernabeu.
The former Juventus midfielder replaced Thiago Motta in the second half just a minute before Barcelona striker Pedro scored the only goal of the game.
Also in friendly action were Seb Larsson and Jozy Altidore with Larsson’s Sweden going down 2-1 to Turkey in Ankara as Mevlut Erding and Olcan Adin scored either side of Ola Toivonen’s equaliser.
Altidore’s USA were defeated 2-0 in Cyprus by Ukraine as Andriy Yarmolenko and Marko Devic scored either side of half time.
In youth international action, Charis Mavrias played 76 minutes for Greece U21 as they pulled off a remarkable 2-1 victory over Turkey in Katerini.
The Greeks were reduced to nine men inside just 25 minutes as Konstantinos Triandafillopulos and Stelios Kitsiou were dismissed after Emrah Bassan had earlier put the visitors ahead.
However, Greece pulled off an astonishing second-half comeback as Nikolaos Karelis and Andreas Bouchalakis notched to secure the win and, more importantly, keep their qualification hopes alive in group seven of the UEFA U21 European Championship qualifiers.
John Egan also featured in UEFA U21 Euro 2015 qualification as he played 90 minutes for the Republic of Ireland who went down 2-1 to Montenegro in Dublin.
Wolves defender Matt Doherty had given the hosts the lead before second-half goals from Luka Đorđević and Stefan Mugoša secured the win for Montenegro.