Ronny Deila has revealed his plans for the on-loan winger.
The 24-year-old has recently had his appeal against a seven-game ban for racism rejected, prompting many to speculate as to whether Celtic will send the winger back to Aston Villa.
Deila, however, says he will keep faith with Tonev - and is still backing him over the SFA.
“Aleks is going to stay,” the Celtic boss told reporters. “We have not talked to them (Aston Villa). Not me anyway. I don’t know if Peter (Lawwell) has.
“ If he had gone in January we would still believe him. He has improved in the last two matches and we have him for the season and that’s what we want him do.
“We are disappointed (with the SFA decision). It’s nothing new, it’s word against word. I don’t say anyone is lying. I just said we need more proof. It’s a hard and harsh decision to take, to say someone is a racist. It’s just in a word, that’s why we support him and believe him."