Former Kilmarnock goalkeeper Cammy Bell says Kilmarnock must hold on to their best players if they're to continue their progression.
"I think Derek McInnes has brought a lot of belief to his squad," he said.
"First and foremost, they work ever so hard in a game. I've watched them a number of times this season. If you play for Derek McInnes, you need to work hard, no matter what position you play on the pitch.
"But also what they've got is quality. They've got good quality within the squad. They've got a strong squad and a bit of depth there as well.
"Again, they went to Ibrox and had a number of players you probably would have expected to start on the bench. I know young Watson came on quite early in the game but again they've got players that are replacing these guys, Donnelly, Polworth, guys that have played a number of games in the top flight.
"So they've got real strength and depth in the squad but I really do just believe it's that momentum and belief that Derek McInnes is bringing to the club.
"But they've got some really, really good and talented players and that's why I said before it's key that Kilmarnock keep these players at the club as well. That's the big job for the board going forward.
"You have Danny Armstrong, you have Matty Kennedy. David Watson is a young, quality player. They need to keep these players at the club if they want to progress."