Jose Mourinho failed to bring in Inter Milan winger Ivan Perisic this summer and is desperate for a new wideman.
However, he has found it very hard to do so, with links to Gareth Bale and Alexis Sanchez proving to be unfounded, and the pursuit of Inter Milan's Ivan Perisic leading him nowhere.
In the current campaign, Carlos has featured in 11 league games, scored 1 goal and provided 4 assists. Undefeated Los Che are in second-place, four points behind Barcelona, and have been playing a very exciting brand of football.
The Spaniard is primarily a central midfielder, but has proved his ability in a more advanced attacking midfield role and on the right flank as well.More news: Harvey Weinstein reportedly sued by actress who accused him of rape
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The Independent says Soler has "greatly impressed United staff" since making his debut for Valencia in December 2016.
After enduring a hard return to Old Trafford last season as the-then world's most expensive player, the 24-year-old as began this campaign in explosive fashion scoring twice and assisting three times in the opening four games.
The Independent suggest that Andreas Pereira may be key to any move for Soler.
Manchester United midfielder Paul Pogba is closing in on a return to action, although Saturday night's trip to Newcastle may come too soon. As a result, Mourinho may opt to sell the Brazilian to Los Che in an attempt to lower their asking price.