Morgan, who made his England debut in the RBS Six Nations this spring will move to Kingsholm from the Scarlets in the summer and Lancaster, having worked with the big number eight already, feels he'll be a great asset for the Cherry and Whites.
"It's a good signing for Gloucester, an exciting signing and I'm sure everyone's pleased to see him back there.
"While Llanelli have done a great job with him in the last few years, from our point of view it's great to see him back at a Premiership club, and it made sense for him to go back to his home club.
"I think he'll be a great acquisition and I'm sure he will make a big impact next season, he's certainly going to be a big player for us on the tour (to South Africa) and moving forward, and we're looking forward to working with him."
The 23 year old certainly caught the eye in the Six Nations, a fact readily admitted by Lancaster.
Morgan was named Man of the Match in the win over Ireland and the England Head Coach feels the South Africa tour is the next challenge for him.
"We knew quite a bit about him before we selected him, but equally, he made a massive impact on the Six Nations.
"To back up the performance he gave from the bench in the France game, that was an achievement in itself, but I thought he played well against Ireland too.
"We're really pleased with the progress he's made, and this South Africa tour will be the next step for him - a big step, but he's excited about it, and we'll be working hard on his fitness before we go."