The club’s top goal scorer limped off with a groin injury in the recent 2-0 victory over Everton, missing United’s last two games as a result.
With their quarter-final tie finely poised at 2-2, Rashford could now be in contention to play on Thursday night in Seville.
Luke Shaw, who has missed United’s last three games, was also back in training alongside Marcel Sabitzer, who suffered a knock just minutes before kick-off ahead of Sunday’s meeting with Nottingham Forest.
Tyrell Malacia, who also missed that game through injury, was also among the group training on Wednesday.
United have been left reeling by a number of injury blows in recent weeks, losing first-choice centre-halves Lisandro Martinez and Raphael Varane in last Thursday’s first leg clash against Sevilla.
Erik ten Hag was without 10 members of his first-team squad on Sunday with Martinez set to miss the rest of the season with a metatarsal fracture in his right foot.
But Rashford’s availability would serve as a huge boost as United enter a season-defining run of three games.
The Premier League side carelessly threw away a two-goal lead against Sevilla last week but have an excellent record against Spanish opposition this season, having beaten Real Sociedad and Real Betis away from home while getting a draw against Barcelona at the Camp Nou.
Following their trip to Spain, United then head to Wembley for their FA Cup semi-final against Brighton.
Next Thursday, they are in action away to Tottenham where a win would see them tighten their grip on a top four finish.
More to follow
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