Teenage midfielder Frank Ross has agreed a one-year contract extension with Aberdeen.
The youth academy graduate has also joined Morton on loan for the rest of the season.
The 19-year-old has made four appearances for the first team this season, three of which have been from the bench.
He started his first game for the club in the 1-0 win over Dundee at the start of December at Dens Park. Frank made his first team debut at the same ground back in May 2015.
The Ellon-born youngster, who has represented Scotland at U19 level, scored his first senior goal against Rangers with a brilliant free-kick and has now made 12 appearances in total for Aberdeen.
Dons boss Derek McInnes said: “We’re delighted at the level of club that Frank is joining, the Championship is extremely competitive and he’ll be working with Jim Duffy who has taken players from here in the past.
“While we’d have liked him to contribute this season, we’ve got to look at the bigger picture and Frank will benefit from regular football that will see him better prepared for the demands of playing for Aberdeen.
“We’re also delighted that Frank has signed a contract extension and we’re really looking forward to seeing how he gets on at Morton.”
Roos has appeared 13 times and scored six goals for Aberdeen’s U20s, helping the Dons youngsters to second place in the Development League table at the halfway point of their season.
— Aberdeen FC (@AberdeenFC) January 18, 2018