The outgoing Celtic boss hailed the 19-year-old winger after his two-goal performance in the title-clinching win over Aberdeen.
Two West Ham players are reportedly keen to leave the club this summer.
Sunderland, Newcastle United and Norwich City were all in action in the Premier League on Saturday.
The Reds beat their London counterparts 2-0 at Anfield.
Arsenal can catch Tottenham Hotspur, if Mauricio Pochettino's side lose on the last day of the season.
Watford have been linked with manager Paco Jemez this summer.
Despite mid-season problems involving Aitor Karanka, Middlesbrough gained promotion to the Premier League after a seven-year absence from the top flight.
Vito Mannone was in fine form as Sunderland beat Chelsea 3-2.
West Ham were beaten 4-1 by Swansea City at Upton Park yesterday.
Everton lost against Leicester City in the Premier League on Saturday evening.
Tottenham Hotspur hero meets chairman Daniel Levy after recent criticism.
Newcastle United's red cards against Nottingham Forest have been rescinded.
The 29-year-old spent a couple of seasons with Leeds United.
Could Celtic win the Scottish Premiership title with Robbie Savage in charge?
Celtic drew 1-1 with Manchester City in Champions League action last night.
Digging deeper into costs.
Red Bull Leipzig have been linked with Celtic's Moussa Dembele. The biggest beneficiaries? Glasgow Rangers...
Leeds United are said to have been keen on the Bolton Wanderers youngster previously.
Leeds United striker's FA Cup involvement is over.
The Tottenham Hotspur youngster has lofty aspirations.