Manchester United officials met Jadon Sancho in March during his loan spell at Borussia Dortmund.
Sancho rejoined Dortmund for a loan fee rising to €7.5million in January after he was banished from the United squad by manager Erik ten Hag, whom he accused of lying over his omission from the squad against Arsenal in September.
Dortmund are 90 minutes away from a third Champions League final after they beat Paris Saint-Germain 1-0 in their semi-final first leg last week and Sancho impressed up against Nuno Mendes on the right-hand side.
Ten Hag noted Sancho's prominent performance will have increased his value amid the probability he will be sold in the summer. United would demand a fee of at least £30million for the 24-year-old three years on from his £72.9m arrival.
Former football director John Murtough and director of football negotiations flew to Dortmund earlier this year to touch base with Sancho. It is common practice for United representatives to check in on loanees.
Goalkeeping coach Richard Hartis stayed in touch with Dean Henderson last season, deputy football director Andy O'Boyle visited Alex Telles when Sevilla played Manchester City in the Champions League and former technical director Darren Fletcher telephoned Eric Bailly while he was at Marseille.
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"We are close in that process," Ten Hag said of United monitoring Sancho. "We are visiting games, not only yesterday. We visit, I would not say all the games, but we have seen more games from Dortmund where Jadon was performing there.
"We also had a visit with him, we had a talk with him during his stay there and we will keep going with this process, we will continually be in contact and communicate with them."
Sancho has tallied a modest three goals and two assists since he returned to Dortmund, only fifth in the Bundesliga table and three points behind fourth-placed RB Leipzig.
While Sancho's midweek performance was predictably overstated, Ten Hag drew attention to Dortmund's disappointing domestic season.
"There was a conflict (between Sancho and Ten Hag) and let’s first finish the season," Ten Hag added. "He is not here now, so stay away from this issue now because it is not important.
"He has the return of the semi-final, for them also in the league it is not going that well for them and we have four important games in the league and the FA Cup final.
"So that is the issue and the focus point in this moment and then we will see in the summer what is going to happen."
