Reina made his World Cup debut for Spain yesterday, as 2010's World Champions bid farewell to this year's tournament with a 3-0 win over Australia.
That debut heralded a clean sheet, making the 31-year-old the subject of praise from all corners of the Twittersphere.
One man who took a particular interest in the game was Belgium's Mertens, who plied his trade alongside Reina at club level last season, when both men played for Serie A side Napoli.
Reina's loan spell at the Italian club has since ended but Mertens had an explicit message for him regarding his future.
Great game @PReina25 , congratulations! Now make me happy and start negotiating a new contract with Napoli.— Dries Mertens (@dries_mertens14) June 23, 2014
It is unclear where Reina will play his football next season, with Napoli boss Rafa Benitez recently ruling out a move on the grounds of having enough cover in goal and on the basis of the Spaniard's wages.
Previously, however, the 31-year-old had been widely tipped to move to Italy on a permanent deal, after stating his regret over how his exit from Liverpool had been dealt with.
Reds boss Brendan Rodgers appears to be happy with current no.1 Simon Mignolet, while Liverpool have also been linked with Michel Vorm this summer.
Nevertheless, a campaign that sees the Anfield side challenge on four fronts could persuade Rodgers to bring Reina back into the fold to provide competition for Mignolet.
Whether Reina would be happier returning to Merseyside or staying in Naples remains to be seen - but Belgium midfielder Mertens has made his feelings perfectly clear. He wants his man: will he get him?