On a season-long loan from Atletico, Saul has enjoyed more minutes with Chelsea in recent weeks.
However, the player's social media activity this week has sparked talk of him wishing to return to Atleti this month.
Saul was posting regularly during Atletico's Copa del Rey defeat to Real Sociedad.
And the midfielder 'liked' a post on Twitter where the Spanish club's performance was criticised, but also stated the team missed him.
In addition, a post by Saúl also caught the attention of followers: "Never stop believing", he wrote.
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