Ronny Deila, the Celtic manager, has been urged to prioritise a Europa League run ahead of the SPFL Premiership by the club's former striker, Chris Sutton.

The six-game group campaign begins tomorrow night away to Red Bull Salzburg in Austria.

Sutton's view was that Celtic will win the Scottish title, so there are league games in which they can rest players in order to ensure their key men remain ready for the main domestic tests.

"Celtic should prioritise the Europa League," said the 41-year-old who signed from Chelsea in summer 2000 for a fee of £6m and went on to score 86 goals in 199 appearances for the Parkhead club.

"They can afford to drop points in the Premiership and still win it, because they are far and away the best team in Scotland. But the players will get a real shot in the arm from performing in the Europa League. There's no reason why they can't do that."

Deila was criticised for playing a weakened team which lost in Inverness last month, but Sutton - part of the team which reached the Uefa Cup final in 2003 - said that would always come with the territory at Parkhead.

"That's never changed here," he said. "My view is that if they get their best 11 players on the pitch they are a strong team who can compete with anybody. The treble is still on, but I think this competition is one where the players will want to be judged and compete.

"They will feel the cup competitions are the ones they should really go for because they can afford to drop points in the league. Criticism comes with that, but that's the way it is at a club like this.

"But the first two games in this group stage are crucial. The main thing in Salzburg is 'don't lose the game'. The first two games are the hardest two for Celtic."

Celtic's second match following the fixture in Austria is at home to Dinamo Zagreb on October 2.