Diego Forlan goes back a long way with Luis Suarez, to 2007 when he set up Suarez's first goal for Uruguay and to 2013, when Suarez set up Forlan's last.
Atletico have been hit hard by coronavirus in recent months, the club confirming another two positive cases on Monday afternoon.
The 33-year-old last played on November 13 during the international break for Uruguay and has not featured for Atletico in LaLiga in just under a month after contracting the illness upon his return.
The positive test means Suarez will miss his club Atletico Madrid's La Liga outing against Barcelona, which would have been the first time he ran out against his former team.
Diego Costa asked to be substituted for what seemed to be a left thigh injury early in the second half.
The striker said his strong start at Atlético eases the pain he felt from leaving Barça, where he was on a team that won 13 titles since arriving in 2014 from Liverpool
Suarez thrived in his debut with Atletico Madrid on Sunday, scoring twice in a 6-1 rout of Granada in the Spanish league and showing that he will be a good fit in Diego Simeone’s team.
Suarez, who is Barcelona's third-highest scorer, joined Atletico Madrid on Thursday.
The 33-year-old Suarez, who reached a deal with Barcelona rival Atletico on Wednesday, broke down a few times while talking about his former teammates and his time with his former club.
Barcelona said late Wednesday that it reached a deal with Atlético Madrid for the transfer of the Uruguay striker for 6 million euros ($7 million).
The squad changes are expected to help Barcelona financially, as the club was hit hard by the coronavirus pandemic.
Liverpool mounted a prolonged and public defence of Luis Suarez's conduct as the row between the rival clubs escalated.
Suarez, 33, recovering from right knee surgery, said it was 'complicated' to talk about players joining Barca at this time of crisis with the coronavirus pandemic.
Edinson Cavani fires Uruguay into last eight as Portugal striker Cristiano Ronaldo's World Cup dream ends
Cavani curled home a superb 62nd-minute winner to settle a thrilling second round duel in Sochi which sends Uruguay into a quarter-final against France next Friday.
Suarez was thrown out of the 2014 World Cup in Brazil and subsequently banned for biting Italian defender Chiellini.