Sanchez could be a threat to Villa's place in coach Pep Guardiola's first team.
"I do not fear pressure. From childhood I wished to play at a big club and these teams are always full of a lot of pressure," said the Spaniard. "It does not bother me. The more pressure there is, the more work I will put in.
"I am pleased that the best can be here and compete together. Being with Barca always requires the most work to earn your position."