A union will meet on Wednesday to decide if a 24-hour strike on London Underground will go ahead.
Tube maintenance workers are due to walk out on Friday
The Rail, Maritime and Transport (RMT) union has called for a walkout by staff of maintenance firm Metronet on Friday.
It is fighting the dismissal of eight workers who were sacked after empty beer cans were found in a staff room.
Metronet upheld the sackings but said it would abide by the outcome of employment tribunals into the dismissals.
The stoppage will disrupt services on the Circle and District, Metropolitan, Hammersmith and City and East London lines.
A Metronet spokesman said: "We believe the employment tribunal process is the right forum from this point and not strikes.
"It remains the fact that we still face the prospect of disruption to key London services because of the actions of a small number of individuals and because seven individuals flouted basic safety rules."
The RMT maintains there was no evidence that the men had been drinking and has accused the company of a "witch hunt".
General secretary of the union Bob Crow said he was waiting for a letter from Metronet making it clear that the workers would be reinstated if they won their employment tribunal cases.
"At the moment the strike remains on," he added.