The pair are now with Sweden's squad, with Isak having left Newcastle for Nottingham Forest during Monday's transfer deadline day.
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Elanga joined Newcastle from Nottingham Forest over the summer and recalled to Expressen: "He is a footballer who has made his choice. Right now I have the opportunity to play with him in the national team.
"For me he is a soccer player. Then there will always be rumours and such. When I was with him, he was completely focused and professional. Right now is a Liverpool player so I support him and wish him luck."
Elanga also emphasised that he did not talk to Isak about the striker's situaton.
"We mostly talked about how I felt and how happy I was with the move. That was all we talked about," he added.