The Colombian’s parents were kidnapped last weekend in his home country, with his mother released shortly after but his father remains a hostage, though there are encouraging reports that he could be released soon.
Diaz has understandably missed Liverpool’s last two games, but returned to training earlier in the week and was included in Liverpool’s matchday squad for Sunday’s Premier League clash against Luton Town.
On Friday, Klopp said the 26-year-old availability for Liverpool was entirely up to him and had yet to be decided ahead of the Luton trip.
Speaking ahead of kick-off, the Reds manager told Sky Sports: ‘It is still pretty emotional but Luis [Diaz] decided three days ago that he wants to try training again.
‘I have said before, the training ground, the football pitch is the safe place for the boys. There he can behave normal and for a few minutes at least forget what is going on.
‘But all the signs he gets as I understand it are very positive.
‘Negotiations are ongoing but it is still positive so that is why he wanted to be part of the team and he could come on as well. From that point of view I have no issue but nobody can imagine how something like that feels.
‘On the training ground he has been fine and that is why he is here.’
During the warm ups, it was reported that both sets of fans at Kenilworth Road applauded Diaz and gave him a standing ovation, and it was said that he seemed in good spirits.
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