Tammy Abraham expecting the worst after injury blow
Abraham, who is on loan from Chelsea until the end of the season, limped off towards the end of the first half with a thigh problem.
The 19-year-old striker will undergo a scan over the next couple of days to discover the severity of the injury.
Chelsea players out on loan
Sun, January 29, 2017
Chelsea have shipped a record 38 players out on loan this summer, but who are they and where have they gone?
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1 of 38
Mukhtar Ali (Vitesse Arnhem)
The England Under-21 international has impressed during his time at Ashton Gate, scoring 21 goals in his 37 appearances so far this term.
Bristol City boss Johnson said after the Elland Road clash: "Tammy Abraham has done something to his thigh. He'll have a scan over the next day or two.
"Tammy is gutted because he feels like it might be a bad one but hopefully that won't be the case."
Tammy Abraham has scored 21 goals for Bristol City
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Abraham's potentially lengthy lay-off will come as a huge blow after the Robins' 2-1 defeat to Leeds saw them move just three points off the relegation zone.
City went two goals down after 47 minutes following goals from Chris Wood and Pablo Hernandez before Milan Djuric pulled one back deep into stoppage time.