"It's a tough level because it's the best league in the world. Playing for Liverpool is even tougher because this team always has to play to win. You also have many players who play for their national teams," Insua told LFC TV.
"But I came back from the tournament in South America two weeks ago and I'm back training with the first team.
"I'll just keep training hard and keep trying to show the boss that I'm good enough.
"It was a difficult decision for me to go away because I'd played four consecutive games but you have to say yes to the national team. I spoke with Rafa and he told me to go.
"I missed some important games like Everton and Chelsea but now I have to think about the future.
"I've had a few games and I think I've done quite well. Playing with the first team has given me a chance to improve.
"The manager gave me a lot of confidence. He told me to keep calm when I play and afterwards he encouraged me to keep going."
