Ange Postecoglou has expressed satisfaction over his Celtic squad's strength in depth after late call-up Moritz Jenz scored a crucial debut goal against Ross County.
The on-loan Lorient centre-back headed home Celtic's second goal in the 84th minute before the Scottish Premiership champions went on to seal a 3-1 victory in Dingwall on Saturday.
With Carl Starfelt only just recovered from a hamstring injury, the German defender was drafted into the team after Stephen Welsh was ruled out through illness after Friday's training session, and he made his mark in dramatic fashion.
Postecoglou said: "Yeah, he was great. He has been training well, he has fitted in really well. I keep saying, these guys, you see them on weekends but I see them every day.
"The level of training is really high at the moment. Everyone is putting their best foot forward, which makes training pretty competitive, so if I have to make a change to the line-up for whatever reason I'm really confident about the guys coming in."
Celtic opened the scoring in the 48th minute when Jota cut back for Kyogo Furuhashi to slot home but Alex Iacovitti headed home from a corner 10 minutes later.
Joe Hart made a good stop from County substitute Owura Edwards before Celtic edged home late on when Jota set up further goals for Jenz and sub Liel Abada.
Postecoglou said: "We know it's a difficult place to come and it's a difficult team to play, and with the conditions being as they are with the wind, you know it's going to be a real challenge."
Celtic's major rivals Rangers scored a 2-0 win over Kilmarnock at Ibrox.
It was a bit of a struggle for the home side but Antonio Colak fired in his first Gers goal in the 51st minute and there was more good news for the home fans when Alfredo Morelos, fit again after being out since March due to a thigh injury, was brought on just after the hour mark before netting the second from close range with two minutes remaining.
A dramatic finish saw St Johnstone seal a 2-1 victory at Motherwell, where Jamie Murphy's 28th-minute effort looked to be the game-winner until second-half added time.
Suddenly a Graham Carey own goal pulled the sides level, but Stevie May stabbed home three minutes later to secure three points for the visitors.
Aberdeen made the most of their one-man advantage after St Mirren's Declan Gallagher was sent off in the 23rd minute of their 4-1 win at Pittodrie.
Australian Associated Press
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